Propionic Acid Outperforms Formic and Acetic Acid in MS Sensitivity for High-Flow Reversed-Phase LC-MS Bottom-Up Proteomics

<p><strong>This study introduces a quantitative workflow for multielement single-cell analysis by mass cytometry using metal-loaded, multielement-barcoded polystyrene beads as calibration standards. Online mixing allows bead and cell events to be distinguished by TOF-MS, enabling elemental concentrations in labeled cells to be quantified from bead responses.</strong></p><p>The approach was demonstrated with Lu-, Nd-, and Ir-labeled cancer cells and extended through a polynomial calibration model to elements not directly included in the beads. Agreement with external calibration highlights the method’s potential as a universal quantitative strategy for mass cytometry and single-cell ICP-TOF-MS.</p><blockquote><h4><strong>The original article</strong></h4><h4><a target="_blank" rel="noopener noreferrer" href="https://pubs.acs.org/ancham/article/98/31/22966/5231419/Quantitative-Single-Cell-Multielemental-Analysis#249383980"><strong>Quantitative Single-Cell Multielemental Analysis Using Metal-Loaded Microparticles: toward a Universal Quantification Workflow in Mass Cytometry</strong></a></h4><p>Ángela de la Rosa-Díaz; Carlos López-Portugués; Mario Corte-Rodríguez*; María Montes-Bayón *</p><p>Anal. Chem. (2026) 98 (31): 22966–22976</p><div><a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1021/acs.analchem.6c02340">https://doi.org/10.1021/acs.analchem.6c02340</a></div><h6>licensed under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/"><strong>CC-BY 4.0</strong></a></h6></blockquote><p><strong>Selected sections from the article follow. Formats and hyperlinks were adapted from the original.</strong></p><div><div><div><div><div><p>Understanding the biochemical and functional heterogeneity of individual cells is a central challenge in modern biology, immunology, oncology, and clinical translational research. Flow cytometry, and, more recently, spectral flow cytometry, (<a href="javascript:;">1</a>) have become essential tools for high-dimensional single-cell analysis. However, obtaining robust quantitative information at the single-cell level remains challenging, particularly when comparing measurements across experiments and laboratories. Quantitative approaches have been developed for fluorescence flow cytometry, typically relying on calibration beads and standardized antibody conjugates to improve interexperimental comparability. (<a href="javascript:;">2−4</a>) Nevertheless, the accuracy of these methods remains influenced by fluorophore-specific properties and labeling variability, highlighting the need for alternative quantitative single-cell analytical strategies.</p></div><div><p>Mass cytometry, or cytometry by time-of-flight (CyTOF), which was introduced by the team of Bandura in 2009, has emerged as a technological breakthrough by substituting fluorophores with isotopically pure metal tags, whose signals are detected by TOF elemental mass spectrometry (MS) using an inductively coupled plasma as ion source (ICP–TOF–MS). (<a href="javascript:;">5</a>) This technology has allowed to remove nearly all spectral overlaps and enabled experiments that can routinely include 40–60 parameters, including not only protein biomarkers but also DNA markers and metallodrugs or nanoparticles. (<a href="javascript:;">6, 7</a>) Numerous studies have taken advantage of the highly multiplex capabilities of CyTOF to investigate immune responses, characterize tumor-infiltrating lymphocytes, or follow hematopoietic differentiation with greater resolution than was previously possible. (<a href="javascript:;">8−10</a>) Indeed, the technique has become central to many multiparametric immunology pipelines by facilitating deeper functional analyses, from mapping subtle cell-cycle states (<a href="javascript:;">11</a>) to profiling intracellular cytokine signatures and activation markers (<a href="javascript:;">12</a>) that are often difficult to resolve by fluorescence-based approaches. (<a href="javascript:;">13</a>)</p></div><div><p>Beyond its multiplexing capability, an often overlooked advantage of mass cytometry is its potential for elemental quantification. Unlike fluorescence-based approaches, ICP–MS-based detection enables direct conversion of signal intensities into elemental amounts through established calibration strategies. This principle, successfully applied for single-cell elemental analysis by ICP–MS (SC–ICP–MS), has shown to be suitable in different applications. Thus, quantification of intrinsic (<a href="javascript:;">14−17</a>) or exogenous (<a href="javascript:;">18−20</a>) elements, as well as protein biomarkers following metal-labeling strategies (<a href="javascript:;">21, 22</a>) compare well with the bulk analyses on the same cell suspension. However, despite the efforts made to develop quantitative strategies, mass cytometry remains as a mainly qualitative strategy, where very few approaches have explored its unquestionable quantification potential. (<a href="javascript:;">4, 23−25</a>)</p></div><div><p>CyTOF data quality depends critically on managing instrumental variability. Plasma fluctuations, partial clogging of the sample introduction system or injector and periodic retuning, introduce changes in sensitivity that can obscure biological differences between samples measured at different times or in different instruments. To mitigate these effects, CyTOF applies multielement calibration polymeric beads, such as EQ six-element calibration beads, that are mixed with every sample at a fixed concentration before nebulization. (<a href="javascript:;">26, 27</a>) These beads, containing defined quantities of yttrium, indium, cerium, terbium, lutetium and bismuth, allow computational normalization and provide a reference signal that corrects for shifts in sensitivity over time. More recently, approaches using frozen antibody master mixes, unified acquisition templates, and sophisticated normalization algorithms have been introduced to enable reproducible multibatch studies and harmonize data sets across different research centers. (<a href="javascript:;">27, 28</a>)</p></div><div><p>Since the sought beads that contain multiple elements in a wide mass range (from <sup>89</sup>Y to <sup>209</sup>Bi) are commercially available and show high reproducibility, they could serve as quantitative (single-point) analytical standards (once characterized accordingly). This use would increase their analytical value not only as mere drift correctors but also as calibrants that are present within the sample (matrix-matched). Such a strategy is aligned with recently proposed particle-based calibration approaches in SP/SC–ICP–MS, which exploit transient events of the same nature as the analyte to avoid transport-efficiency-related uncertainties. (<a href="javascript:;">29</a>) In this way, the estimation of parameters like transport efficiencies of the ionic standards is eliminated, reducing the associated uncertainties. Moreover, since the beads are routinely added to all samples in CyTOF, any raw data file could be reprocessed at any time to extract any quantitative information without any additional measurements.</p></div><div><p>Despite their routine use for signal normalization, CyTOF calibration beads have not been systematically explored as quantitative standards for single-cell elemental analyses. Their use for quantification implies several analytical challenges, including the accurate characterization of their elemental content, the translation of bead-derived responses into cellular elemental amounts, and the extension of the calibration strategy to isotopes that are not present in the beads. Addressing these challenges is essential before calibration beads can be used as reliable quantitative reference.</p></div><div><p>An interesting additional feature of plasma-based techniques is their relatively uniform sensitivity across the entire mass range. It has been described that the observed instrumental response in most ICP–MS can be fitted to a simple equation as a function of the <i>m</i>/<i>z</i> of the isotope to be measured for the elements with similar ionization in the plasma, such as the lanthanides. (<a href="javascript:;">30, 31</a>) If the transient signals of the multielemental beads are used to obtain the instrumental responses and these are empirically modeled across the monitored <i>m</i>/<i>z</i> range, a practical route toward multielemental quantification strategy is obtained. This would represent a quantification workflow for multiplex single-cell elemental analysis that repurposes multielement CyTOF calibration beads as generic standards. Such an approach seeks to address the limitations in calibration procedures and, ultimately, to enhance the quantitative applications of high-dimensional single-cell MS that can be applied not only to CyTOF-based analysis but could also be extended to any other SC–ICP–MS analysis using any other TOF mass analyzers.</p><h4><strong>Experimental Section</strong></h4><h5><strong>Instrumentation</strong></h5><div><p>The single-particle ICP–MS measurements were performed by using the <a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/all/products/1206"><strong>iCAP TQ triple quadrupole ICP–MS system</strong></a> from Thermo Fisher Scientific (Bremen, Germany). All measurements were done using the standard configuration for sample introduction, including the Micro-Mist nebulizer at a sample flow rate of 0.4 mL min<sup>–1</sup> and a cyclonic spray chamber. The sample introduction setup was used together with a T<strong>eledyne Cetac ASX-560 autosampler.</strong> SP-ICP-MS characterizacion of the lanthanide-loaded polystyrene beads was carried out setting a dwell time of 5 ms. Daily optimization of ICP–MS was performed to enhance signal sensitivity, ensuring that the generation of oxide ions and doubly charged species remained below 3% and 5%, respectively.</p></div><div><p>The CyTOF experiments were conducted in a <strong>CyTOF XT</strong> (Standard BioTools, San Francisco, CA, USA). This instrument is an ICP–MS that operates TOF mass analyzer with a shortened mass coverage from <i>m</i>/<i>z</i> 75 to 209. The samples are placed in a refrigerated carousel at 4 <span>°</span>C and injected into the CyTOF with a hydraulic autosampler that is able to handle sample introduction and system washing. The autosampler automatically adds the EQ6 calibration beads (Standard BioTools) to every sample at a 1:10 dilution. After mixing, the bead-containing sample is injected at 30 μL·min<sup>–1</sup> through a pneumatic nebulizer and a spray chamber that is heated at 200 <span>°</span>C. using a constant sample flow of at 10 μL min<sup>–1</sup>. Microparticle imaging was carried out with a <strong>JEOL JEM-2100F transmission electron microscope.</strong></p><h4><strong>Results and Discussion</strong></h4><h5><strong>BiRM: An Interpolated Model for Multielement Quantification</strong></h5><p>Taking advantage of the multielemental composition of the beads uniformly distributed along the CyTOF measuring range, their molar response factors can be estimated and plotted against the <i>m</i>/<i>z</i> of each of the isotopes contained on the beads. This is possible thanks to the high ionization efficiency achievable in the plasma for the elements of the beads that is close to 100%. In that case, previous publications demonstrated that the ICP–MS molar response can be modeled using different theoretical equations. (<a href="javascript:;">30, 31</a>) Consequently, the molar responses (<i>n</i><sub>resp</sub>) for all the 8 isotopes of the 6 elements contained in the beads (typically &gt;5000 events) were calculated as in <a href="javascript:;">eq 3</a> and represented against the mass-to-charge ratio (<i>m</i>/<i>z</i>). The molar response, differently to the previously reported response factor (α<sub>i</sub>), takes into account the atomic mass of the element and isotope, the isotope abundance, and the concentration. This response was fitted empirically to polynomial functions of degree 2, 3, 4, and 5, resulting in the quartic function the one with the best correlation (<i>r</i><sup>2</sup> = 0.99) while avoiding overfitting of the data. The response factors for all the isotopes are represented in <a href="javascript:;">Figure 4</a> (every data point considered for the fitting corresponds to the average intensity obtained for a minimum of 5000 bead events and the corresponding standard deviation), together with the fitted quartic polynomial function of <a href="javascript:;">eq 4</a>. This behavior showing a mass-dependent response with a slight decrease at high <i>m</i>/<i>z</i> is also consistent with published results using ICP–TOF–MS instruments. (<a href="javascript:;">34</a>) The fourth-order polynomial was used as an empirical interpolation of the instrumental response within the calibrated mass range in our specific CyTOF instrument, without physical significance of the coefficients.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Anal_Chem_2026_98_31_22966_22976_Figure_4_Molar_response_factors_for_every_isotope_in_the_beads_b8317c3de7.jpg" alt="Anal. Chem. (2026) 98 (31): 22966–22976: Figure 4. Molar response factors for every isotope in the beads as a function of m/z and the quartic function model (dashed line) that fits such data obtained using CyTOF results. Standard deviation of each data point is also included (only distinguishable in the case of 140Ce)." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Anal_Chem_2026_98_31_22966_22976_Figure_4_Molar_response_factors_for_every_isotope_in_the_beads_b8317c3de7.jpg 245w," sizes="100vw" width="996" height="492"></p><p>Using the <i>m</i>/<i>z</i> of the isotope of interest and by interpolation in the curve, it is possible to estimate its molar response on each sample (matrix matched). Out of the obtained molar response and taking the integrated dual counts obtained for such isotope in the sample, inferring its mass in a single cell event is straightforward. <a href="javascript:;">Figure 5</a>A shows the correlation between the predicted (using <a href="javascript:;">eq 4</a>) and the experimental value (using <a href="javascript:;">eq 3</a>) for the molar responses of the isotopes contained in the beads. A good correlation can be observed (<i>R</i><sup>2</sup> = 0.99), with a slope of 0.99, suggesting an excellent ability of the model to calculate the molar sensitivity of these isotopes.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Anal_Chem_2026_98_31_22966_22976_Figure_5_A_Plot_showing_the_correlation_between_the_Bi_RM_predicted_and_the_experimental_molar_response_for_the_multielemental_beads_6acfc9378b.jpg" alt="Anal. Chem. (2026) 98 (31): 22966–22976: Figure 5. (A) Plot showing the correlation between the BiRM-predicted and the experimental molar response for the multielemental beads and (B) the correlation of 8200 individual cell events obtained by BiRM versus calibration with 175Lu standards. Error bars were omitted for clarity. Experimental uncertainties associated with the molar response factors are reported in Table 2." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Anal_Chem_2026_98_31_22966_22976_Figure_5_A_Plot_showing_the_correlation_between_the_Bi_RM_predicted_and_the_experimental_molar_response_for_the_multielemental_beads_6acfc9378b.jpg 116w," sizes="100vw" width="997" height="1336"></p><p>Although it is possible to perform the described calculations using a datasheet like from microsoft excel, Google Sheets, or LibreOffice Calc, the BiRM interpolation and quantification workflow becomes increasingly cumbersome as the number of isotopes, events and biological replicates grows. For this reason, an in-house script has been developed in R, which is provided as <a target="_blank" rel="noopener noreferrer" href="https://pubs.acs.org/ancham/article-supplement/5231419/pdf/ac6c02340_si_001/">Supporting Information</a>. The script, which is fully transparent and open-access, operates directly on the data matrix generated for either cell events or calibration-bead events after standard CyTOF preprocessing (see the Experimental section). By introducing the elemental information required for BiRM calculations as described in the accompanying “Readme” file, the script automatically computes the molar or mass amount of each element per cell. In addition, it generates summary statistics, diagnostic figures and histograms for rapid quality assessment. This implementation ensures reproducibility, minimizes operator-dependent variability and allows users to reprocess previously acquired data sets without any additional experimental steps. A continuously updated version of software will be made available in a public repository, where future improvements, extension and documentation will be deposited. Because the isotopes used in <a href="javascript:;">Figure 5</a>A were also employed to construct the BiRM model, an additional leave-one-out validation was performed to assess its predictive capability. In each iteration, one calibration isotope was excluded from the fitting procedure and its molar response factor was subsequently predicted using a model constructed from the remaining isotopes. The predicted values were then compared with the experimentally determined molar response factors. The leave-one-out validation yielded a mean absolute relative error (MARE) of 14.3%, compared with 8.3% for the all-in model. As expected, prediction errors increased when an isotope was excluded from the model construction. However, the obtained deviations remained within a reasonable range considering the limited number of calibration points available for model fitting.</p><h4><strong>Conclusion</strong></h4><p>This study presents a practical route to quantitative mass cytometry by repurposing the multielement calibration beads that are routinely added to CyTOF samples as in-tube quantitative standards that can be extended not only to CyTOF but also to any other TOF-based ICP–MS instruments. Two complementary strategies were proposed. First, BaQS performs single-point calibration for bead-encoded isotopes to obtain the absolute mass of lanthanide per cell. Second, the BiRM makes use of the multielement bead signature to empirically model the instrumental response across the monitored <i>m</i>/<i>z</i> window, enabling the prediction of response factors for isotopes that are not present in the beads. The results indicate that both strategies provided accurate results with no statistically significant differences with the validated external standards calibration for the quantification of bead-contained and noncontained lanthanides, being BaQS and BiRM simpler, faster, more efficient, and ready to be applied to already acquired data with no additional measurements needed.</p></div></div></div></div></div></div>

Quantitative Single-Cell Multielemental Analysis Using Metal-Loaded Microparticles: toward a Universal Quantification Workflow in Mass Cytometry

<p><strong>In the week from August 31, the following webinars await you in the field of atomic and molecular spectroscopy and spectrometry</strong></p><blockquote><h4><a target="_blank" rel="noopener noreferrer" href="https://icpms.labrulez.com/webinars"><strong>👉 DETAILS AND REGISTRATION IN THE WEBINARS SECTION</strong></a></h4><p><strong>👉 Search and filter in the largest global database</strong> with over <strong>5 500 GC, LC, MS and spectroscopy webinars</strong>.</p></blockquote><h5><strong>1. Technology Networks: Modern Methods for Faster Microbial Analysis</strong></h5><ul><li>Tu, 1.9.2026 11:00 CEST</li><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/all/webinar/6454">Registration</a></li></ul><p>Struggling to choose the right technique for microbial testing? Learn how MALDI-TOF, FTIR, and automated DNA/RNA electrophoresis accelerate identification.</p><h5><strong>2. Agilent Technologies: ICP-MS for Hybrid Photoelectrode Characterization</strong></h5><ul><li>Tu, 1.9.2026 21:30 CEST</li><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/all/webinar/6411">Registration</a></li></ul><p>Quantify catalyst loading on hybrid photoelectrodes and discover how the Agilent 7850 ICP-MS supports solar fuel research.</p><h5><strong>3. SciY/Mestrelab Research: From Legacy Workflows to Paperless Labs: Track Every Sample, Process, and Decision</strong></h5><ul><li>Th, 3.9.2026 17:00 CEST</li><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/all/webinar/6425">Registration</a></li></ul><p>Transform your lab from paper to digital. Learn how WebLab and LIMS workflows automate sample tracking and support laboratory compliance.</p><h5><strong>4. Agilent Technologies: Learn to Select and Apply the Proper Internal Standard in ICP-OES</strong></h5><ul><li>Th, 3.9.2026 20:00 CEST</li><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/all/webinar/6412">Registration</a></li></ul><p>Master the use of internal standards in ICP-OES and learn how to select suitable standards to correct matrix effects and signal drift.</p>

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Eaton 9E Extended Battery Module (9EEBM72)

The Eaton 9EEBM72 external battery module expands the capacity of 9E UPS systems and extends runtime during outages. Easy integration enables quick expansion without complex installation.

<p><strong>The Eaton 9E Extended Battery Module (EBM), model 9EEBM72, is designed to extend the backup runtime of </strong><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products?category=407"><strong>Eaton 9E UPS systems</strong></a><strong>. It ensures reliable operation and uninterrupted power supply to connected equipment during outages.</strong></p><p>With its robust design and high battery capacity, the module is well suited for applications requiring extended runtime. It is supplied with a connection cable and enables easy integration into existing UPS infrastructure.</p><p><strong>Installation is simple</strong> and provides a seamless transition to backup power without interruption.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Eaton_9_E_Extended_Battery_Module_9_EEBM_72_6_bd6b634a57.jpg" alt="Eaton 9E Extended Battery Module (9EEBM72)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Eaton_9_E_Extended_Battery_Module_9_EEBM_72_6_bd6b634a57.jpg 176w," sizes="100vw" width="1000" height="888"></p><h3><strong>Key features</strong></h3><ul><li><strong>Extends backup runtime</strong> for Eaton 9E UPS systems</li><li><strong>Sealed, maintenance-free </strong>lead-acid batteries</li><li><strong>High operational reliability</strong>, even in demanding applications</li><li><strong>Simple installation and easy system integration</strong></li><li>Supplied with a power connection cable</li><li><strong>Complies with international standards</strong></li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Eaton_9_E_Extended_Battery_Module_9_EEBM_72_5_bae8f57740.jpg" alt="Eaton 9E Extended Battery Module (9EEBM72)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Eaton_9_E_Extended_Battery_Module_9_EEBM_72_5_bae8f57740.jpg 235w," sizes="100vw" width="1000" height="665"></p><h3><strong>Technical specifications</strong></h3><ul><li><strong>Product type:</strong> Extended Battery Module (EBM)</li><li><strong>Catalog number:</strong> 9EEBM72</li><li><strong>Battery type:</strong> Sealed, lead-acid</li><li><strong>Battery rating:</strong> 12 V / 9 Ah</li><li><strong>Number of batteries:</strong> 12</li><li><strong>Dimensions (W × H × D):</strong> 39.9 × 33 × 19 cm</li><li><strong>Weight:</strong> 35.8 kg</li><li><strong>Compliances:</strong> CE Marked , TUV</li><li><strong>Certifications:</strong>&nbsp;<ul><li>IEC/EN 62040-1</li><li>IEC/EN 62040-2</li><li>CE</li><li>EAC</li></ul></li><li><strong>Package contents:</strong>&nbsp;<ul><li>EBM module</li><li>power cable</li><li>quick start guide</li></ul></li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Eaton_9_E_Extended_Battery_Module_9_EEBM_72_7_b49f626968.jpg" alt="Eaton 9E Extended Battery Module (9EEBM72)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Eaton_9_E_Extended_Battery_Module_9_EEBM_72_7_b49f626968.jpg 178w," sizes="100vw" width="1000" height="876"></p>

Linde Food Grade Nitrogen – Gas Cylinder

Food grade nitrogen from Linde for MAP packaging, inerting, and food protection. Prevents oxidation and extends product shelf life.

<p><strong>Food grade nitrogen from </strong><span><strong>Linde</strong></span><strong> is a high-purity inert gas designed for use in the food and beverage industry. It complies with all relevant regulations for food-contact applications.</strong></p><p>Nitrogen is primarily used to displace oxygen, preventing oxidation, microbial growth, and product degradation. Its inert nature helps extend shelf life while preserving product quality, taste, and appearance.</p><p>It is suitable for a wide range of applications, including modified atmosphere packaging and beverage inerting.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>Food-grade quality compliant with regulations</li><li>Inert gas with no impact on taste or odor</li><li>Prevents oxidation and microbial growth</li><li>Extends shelf life of products</li><li>Suitable for MAP packaging and inerting</li><li>Colorless and odorless</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> nitrogen (N₂)</li><li><strong>Grade:</strong> food grade</li><li><strong>Supply form:</strong> gas cylinder<ul><li>20 L (200 bar)</li><li>50 L (200 bar)</li></ul></li></ul><h4><span><strong>Applications</strong></span></h4><h5><strong>Food Industry:</strong></h5><ul><li>Modified Atmosphere Packaging (MAP)</li><li>Oxygen displacement during packaging</li><li>Storage of oils and fats to prevent oxidation</li><li>Cryogenic cooling and freezing (liquid nitrogen)</li></ul><h5><strong>Beverage Industry:</strong></h5><ul><li>Inerting of beverages and equipment</li><li>Wine preservation and storage</li><li>Shelf-life extension of beverages</li></ul>

Linde Argon for Spectrometry – Gas Cylinder

Linde Argon ≥99.998% for spectrometry, GC, and research. High-purity inert gas ensuring stable and accurate analytical measurements.

<p><strong>Argon for spectrometry from </strong><span><strong>Linde</strong></span><strong> is a high-purity inert gas with a purity of ≥ 99.998%, designed for demanding analytical and laboratory applications.</strong></p><p>Its chemical inertness and low impurity levels make it ideal for spectrometric techniques, ensuring stable and reproducible measurement conditions. Argon is commonly used as a carrier gas in gas chromatography and as a protective gas in spectroscopic material analysis.</p><p>It is particularly suitable for applications where gas purity, minimal interference, and high analytical accuracy are essential.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>High purity ≥ 99.998%</li><li>Chemically inert gas</li><li>Low trace impurity levels</li><li>Suitable for spectrometry and GC</li><li>Stable and reproducible performance</li><li>Colorless and odorless</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> argon (Ar)</li><li><strong>Purity:</strong> ≥ 99.998%</li><li><strong>Supply form:</strong> gas cylinder</li></ul><h4><span><strong>Applications</strong></span></h4><ul><li>Carrier gas in gas chromatography (GC)</li><li>Protective gas for spectrometric material testing</li><li>Spectrometry (e.g., emission and mass spectrometry)</li><li>Measurement and analytical technologies</li><li>Research and development</li></ul>

Linde Argon 4.6 – Gas Cylinder

Linde Argon 4.6 for MIG, TIG, and plasma welding. High-purity inert gas ensuring stable arc ignition and oxidation-free weld protection.

<p><strong>Argon 4.6 from </strong><span><strong>Linde</strong></span><strong> is a high-purity inert gas primarily used as a shielding gas for welding applications. Its low ionization potential enables easy arc ignition and stable arc performance without reacting with the welded materials.</strong></p><p>Argon effectively protects the weld pool from oxidation and atmospheric contamination, ensuring high weld quality and mechanical integrity. It is suitable for a wide range of welding methods and materials.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>High purity (grade 4.6)</li><li>Chemically inert gas</li><li>Low ionization potential for easy arc ignition</li><li>Stable welding arc</li><li>Protection against oxidation</li><li>Suitable for various metals and alloys</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> argon (Ar)</li><li><strong>Purity:</strong> typically ≥ 99.996% (4.6 grade)</li><li><strong>Standard:</strong> ČSN EN ISO 14175</li><li><strong>Supply form:</strong> gas cylinder<ul><li>10 l (200 bar)</li><li>20 l (200 bar)</li><li>50 l (200 bar)</li><li>50 l (300 bar)</li></ul></li></ul><h4><span><strong>Applications</strong></span></h4><ul><li><strong>Shielding gas for MIG welding</strong><ul><li>aluminum and its alloys</li><li>copper and its alloys</li><li>nickel and its alloys</li></ul></li><li><strong>Shielding gas for TIG (GTAW) welding</strong><ul><li>carbon and alloy steels</li><li>stainless steels (CrNi)</li><li>aluminum, copper, nickel and alloys</li></ul></li><li><strong>Plasma arc welding (PAW)</strong></li><li><strong>Root protection during welding</strong></li><li><strong>Welding of titanium and high-alloy materials</strong></li><li><strong>Filling gas for lamps and lighting</strong></li></ul>

Linde Argon 4.8 – Gas Cylinder

Linde Argon 4.8 for MIG, TIG, and plasma welding. High-purity inert gas ensuring stable arc performance and high-quality, oxidation-free welds.

<p><strong>Argon 4.8 from </strong><span><strong>Linde</strong></span><strong> is a high-purity inert gas designed for demanding welding applications, particularly for non-ferrous metals. Compared to standard grades, its higher purity ensures improved arc stability and superior weld quality.</strong></p><p>Its low ionization potential enables easy arc ignition and stable arc performance without reacting with the base material. Argon effectively protects the weld pool from oxidation and contamination, which is critical for sensitive materials.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>High purity (grade 4.8)</li><li>Chemically inert gas</li><li>Stable and easy arc ignition</li><li>Improved weld quality</li><li>Protection against oxidation</li><li>Suitable for non-ferrous and alloy materials</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> argon (Ar)</li><li><strong>Purity:</strong> typically ≥ 99.998% (4.8 grade)</li><li><strong>Standard:</strong> ČSN EN ISO 14175</li><li><strong>Supply form:</strong> gas cylinder<ul><li>5 L (200 bar)</li><li>10 L (200 bar)</li><li>20 L (200 bar)</li><li>50 L (200 bar)</li><li>50 L (300 bar)</li></ul></li></ul><h4><span><strong>Applications</strong></span></h4><ul><li><strong>Shielding gas for MIG welding</strong><ul><li>aluminum and its alloys</li><li>copper and its alloys</li><li>nickel and its alloys</li></ul></li><li><strong>Shielding gas for TIG (GTAW) welding</strong><ul><li>carbon and alloy steels</li><li>stainless steels (CrNi)</li><li>aluminum, copper, nickel and alloys</li></ul></li><li><strong>Plasma arc welding (PAW)</strong></li><li><strong>Root protection during welding</strong></li><li><strong>Welding of sensitive and high-alloy materials</strong></li><li><strong>Filling gas for lamps and lighting</strong></li></ul>

Linde Argon 5.0 – Gas Cylinder

Linde Argon 5.0 for TIG, PAW, GC, and spectrometry. Ultra-high purity inert gas for sensitive materials and precision analytical applications.

<p><strong>Argon 5.0 from </strong><span><strong>Linde</strong></span><strong> is a high-purity inert gas (≥ 99.999%) designed for demanding applications where maximum purity and stability are essential.</strong></p><p>Its exceptional purity makes it ideal for welding sensitive metals such as titanium, tantalum, and zirconium, where even trace contamination can affect weld quality. Argon 5.0 is also widely used in analytical techniques, semiconductor processes, and research environments, ensuring stable and reproducible conditions.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>Very high purity ≥ 99.999% (5.0 grade)</li><li>Chemically inert gas</li><li>Extremely low impurity levels</li><li>Suitable for sensitive materials and precision processes</li><li>Stable analytical and process conditions</li><li>Versatile applications (welding, analytics, research)</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> argon (Ar)</li><li><strong>Purity:</strong> ≥ 99.999% (5.0 grade)</li><li><strong>Standard:</strong> ČSN EN ISO 14175</li><li><strong>Supply form:</strong> gas cylinder<ul><li>10 L (200 bar)</li><li>20 L (200 bar)</li><li>50 L (200 bar)</li></ul></li></ul><h4><span><strong>Applications</strong></span></h4><ul><li><strong>Shielding gas for TIG and PAW welding</strong><ul><li>titanium, tantalum, zirconium and sensitive metals</li></ul></li><li><strong>Semiconductor industry</strong><ul><li>deposition and diffusion processes</li><li>thin film preparation</li></ul></li><li><strong>Analytical applications</strong><ul><li>carrier gas in gas chromatography (GC)</li><li>protective gas in spectrometric analysis</li></ul></li><li><strong>Lighting industry</strong><ul><li>filling gas for lamps</li></ul></li><li><strong>Measurement technology, research and development</strong></li></ul>

Linde Argon 6.0 – Gas Cylinder

Linde Argon 6.0 (≥99.9999%) for GC, spectrometry, and semiconductors. Ultra-high purity inert gas for the most demanding analytical applications.

<p><strong>Argon 6.0 from </strong><span><strong>Linde</strong></span><strong> is an ultra-high purity inert gas with a purity of ≥ 99.9999%, designed for the most demanding applications in analytics, semiconductor manufacturing, and research.</strong></p><p>Its extremely low level of trace impurities makes it ideal for use in gas chromatography, spectrometry, and other contamination-sensitive techniques. It ensures maximum measurement stability, minimal interference, and excellent reproducibility.</p><p>Argon 6.0 is also well suited for advanced technological processes such as thin film deposition and diffusion processes, where ultra-clean protective atmospheres are required.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>Ultra-high purity ≥ 99.9999% (6.0 grade)</li><li>Extremely low trace impurity levels</li><li>Chemically inert gas</li><li>Ideal for analytical and semiconductor applications</li><li>High stability and reproducibility</li><li>Suitable for the most demanding applications</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> argon (Ar)</li><li><strong>Purity:</strong> ≥ 99.9999% (6.0 grade)</li><li><strong>Standard:</strong> ČSN EN ISO 14175</li><li><strong>Supply form:</strong> gas cylinder<ul><li>10 L (200 bar)</li><li>50 L (200 bar)</li></ul></li></ul><h4><span><strong>Applications</strong></span></h4><ul><li><strong>Semiconductor industry</strong><ul><li>deposition and diffusion processes</li><li>thin film manufacturing</li></ul></li><li><strong>Analytical applications</strong><ul><li>carrier gas in gas chromatography (GC)</li><li>protective gas in spectrometric analysis</li></ul></li><li><strong>Lighting industry</strong><ul><li>filling gas for lamps</li></ul></li><li><strong>Measurement technologies</strong></li><li><strong>Research and development</strong></li></ul>

Linde Acetylene for Flame Photometry - Gas Cylinder

Linde Acetylene ≥99.6% for flame photometry and AAS. High-efficiency fuel gas delivering stable flame conditions for analytical and industrial applications.

<p><strong>Acetylene for flame photometry from </strong><span><strong>Linde</strong></span><strong> is a highly efficient fuel gas supplied at approximately 99.6% purity, dissolved in acetone or DMF (dimethylformamide). This dissolved form ensures safe storage and handling by stabilizing the gas within a porous mass inside the cylinder.</strong></p><p>Acetylene offers the highest flame temperature among commonly used fuel gases and provides rapid heating. These properties make it suitable for both analytical and industrial applications. In analytical chemistry, it is widely used as a fuel gas for flame photometry and atomic absorption spectrometry (AAS), ensuring stable flame conditions and accurate measurements.</p><p>Thanks to specially designed cylinders, acetylene supplied by Linde meets the strictest industrial safety standards and ensures reliable operation.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>Highest efficiency among fuel gases</li><li>High purity (~≥ 99.6%) for analytical applications</li><li>Dissolved in acetone or DMF for safe handling</li><li>Stable and high-temperature flame</li><li>Suitable for analytical and industrial use</li><li>Complies with strict safety standards</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> acetylene (C₂H₂)</li><li><strong>Purity:</strong> approx. ≥ 99.6% (photometry grade)</li><li><strong>Supply form:</strong> dissolved in acetone or DMF in gas cylinder</li></ul><h4><span><strong>Applications</strong></span></h4><h5><strong>Analytical Applications:</strong></h5><ul><li>Fuel gas for flame photometry</li><li>Fuel gas for atomic absorption spectrometry (AAS)</li></ul><h5><strong>Industrial Applications:</strong></h5><ul><li>Flame welding and brazing</li><li>Oxy-fuel cutting</li><li>Heat treatment (e.g., carburizing)</li><li>Flame heating and hot forming</li><li>Flame cleaning, hardening, and straightening</li></ul><h5><strong>Other Applications:</strong></h5><ul><li>Glass industry (e.g., separation layer formation)</li></ul>

Linde Acetylene Pure – Gas Cylinder

Linde Acetylene ≥98.5% for welding, cutting, and heating. Highly efficient fuel gas with the highest flame temperature and rapid heating performance.

<p><strong>Pure acetylene from </strong><span><strong>Linde</strong></span><strong> is a highly efficient fuel gas supplied at a purity of ≥ 98.5%, dissolved in acetone. This form ensures safe storage and handling by stabilizing the gas within a porous mass inside the cylinder.</strong></p><p>Acetylene provides the highest flame temperature among commonly used fuel gases and delivers rapid heating performance. When combined with oxygen, it offers outstanding technological properties, making it suitable for a wide range of industrial applications.</p><p>Its unique characteristics make it ideal not only for welding and cutting but also for metallurgical processes (e.g., carburizing) and glass manufacturing.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>Highest efficiency among fuel gases</li><li>Purity ≥ 98.5%</li><li>Dissolved in acetone for safe handling</li><li>Very fast heating capability</li><li>Stable and high-temperature flame</li><li>Versatile industrial applications</li></ul><h4><span><strong>Technical Specifications</strong></span></h4><ul><li><strong>Gas:</strong> acetylene (C₂H₂)</li><li><strong>Purity:</strong> ≥ 98.5%</li><li><strong>Supply form:</strong> dissolved in acetone in gas cylinder</li><li><strong>Cylinder type:</strong><ul><li>1.8 kg</li><li>4 kg</li><li>7 kg</li><li>8 kg</li><li>10 kg</li></ul></li></ul><h4><span><strong>Applications</strong></span></h4><ul><li>Flame welding and brazing</li><li>Oxy-fuel cutting</li><li>Flame heating</li><li>Flame gouging</li><li>Flame hardening</li><li>Flame cleaning and straightening</li><li>Hot forming</li></ul><h5><strong>Additional applications:</strong></h5><ul><li>Metallurgy (e.g., surface carburizing)</li><li>Glass industry (e.g., separation layer formation)</li></ul>

Thermo Scientific Nicolet iS20 FTIR Spectrometer

Nicolet iS20 FTIR spectrometer with LightDrive optics, <0.25 cm⁻¹ resolution, cloud connectivity, and advanced mixture analysis capabilities.

<p>The <strong>Thermo Scientific Nicolet™ iS™ 20 FTIR Spectrometer</strong> represents a <strong>next-generation FTIR platform</strong> designed for <strong>fast and accurate identification of mixtures, contaminants, and trace components</strong> across applications including <strong>QA/QC, pharmaceuticals, polymers, and forensics</strong>.</p><p>At the core of the system is the <strong>LightDrive™ Optical Engine</strong>, integrating the <strong>source, laser, interferometer, and detector</strong> into a single optimized module. This design delivers <strong>high spectral resolution (&lt;0.25 cm⁻¹)</strong> and a <strong>signal-to-noise ratio up to 50,000:1</strong>, enabling detection of low-level components.</p><p>The instrument features a <strong>touchscreen interface with multi-color LED status indicators (ready / scan / alert)</strong> for intuitive operation. A <strong>sealed and purge-ready optical bench</strong> ensures long-term stability even in demanding environments.</p><p>The system supports <strong>cloud-enabled workflows via Thermo Fisher Cloud</strong> and uses <strong>OMNIC™ / OMNIC Specta™ software</strong>, including a library of <strong>&gt;9,000 spectra</strong> for rapid unknown identification.</p><h4><span><strong>Key Features</strong></span></h4><ul><li>LightDrive™ optical engine (source, laser, interferometer, detector)</li><li>Spectral resolution &lt; 0.25 cm⁻¹</li><li>Signal-to-noise ratio up to 50,000:1</li><li>Touchscreen interface with LED status indicators</li><li>10-year warranty on source, laser, and interferometer</li><li>High data reproducibility (stable IR source)</li><li>Sealed, purge-ready optics</li><li>Cloud connectivity (Thermo Fisher Cloud)</li><li>OMNIC™ and OMNIC Specta™ software (&gt;9,000 spectra library)</li><li>Automated validation (IQ/OQ, pharmacopeias)</li><li>Wide accessory compatibility (SMART, microscopy, TGA-IR)</li></ul><h3><span><strong>Technical Specifications</strong></span></h3><h4><span><strong>Optics and Performance</strong></span></h4><ul><li><strong>Spectral range:</strong><ul><li>7800–350 cm⁻¹ (standard KBr)</li><li>11,000–375 cm⁻¹ (XT-KBr extended range)</li></ul></li><li><strong>Spectral resolution:</strong> &lt; 0.25 cm⁻¹</li><li><strong>Signal-to-noise ratio:</strong> 50,000:1</li><li><strong>Laser: solid-state diode laser (10-year warranty)</strong></li><li><strong>Beamsplitter:</strong><ul><li>KBr/Ge (standard)</li><li>XT-KBr/Ge (optional)</li></ul></li></ul><h4><span><strong>Detection and Sources</strong></span></h4><ul><li><strong>Detector:</strong><ul><li>DTGS (standard)</li><li>optional high-sensitivity detectors (e.g., MCT)</li></ul></li><li><strong>Source:</strong><ul><li>stabilized IR source (non-migrating hot spot)</li><li>optional tungsten/halogen</li></ul></li></ul><h4><span><strong>Construction and Validation</strong></span></h4><ul><li><strong>Optical system:</strong> sealed and purge-ready</li><li><strong>Validation:</strong> integrated SPV, ASTM/NIST traceable</li><li><strong>Compliance:</strong><ul><li>USP / Ph. Eur. / JP / CP</li><li>21 CFR Part 11</li></ul></li></ul><h4><span><strong>Interface and Software</strong></span></h4><ul><li>USB 2.0</li><li>Thermo Fisher Cloud</li><li>Software: OMNIC™ / OMNIC Specta™</li></ul><h4><span><strong>Dimensions and Weight</strong></span></h4><ul><li>Dimensions: 570 × 550 × 250 mm</li><li>Weight: 32 kg</li></ul><h4><span><strong>Electrical</strong></span></h4><ul><li>100–240 V, 50–60 Hz</li></ul>

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