Complete PFAS solutions for routine environmental laboratories

Importance of the Topic

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants that pose regulatory and analytical challenges for routine environmental laboratories. Robust, reproducible workflows are essential to produce defensible data for diverse matrices (drinking water, groundwater, surface water, wastewater, soil extracts) while controlling contamination risk, minimizing analyst variability, and meeting evolving regulatory reporting requirements. Streamlined automation, efficient sample preparation, and compliant detection strategies collectively reduce rework, improve throughput, and support long-term laboratory scalability.

Objectives and Study Overview

This document presents an end-to-end PFAS workflow engineered for high-throughput environmental testing. It combines automated dispersive liquid–liquid microextraction (DLLME) with flexible UHPLC separation and two alternative mass-spectrometric detection paths to address the main sources of variability in routine PFAS analysis: manual sample preparation, matrix interference, and inadequate chromatographic confirmation. The goal is to deliver a reproducible, low-solvent, scalable solution suitable for regulated laboratories.

Methodology and Sample Preparation

The core sample-preparation approach is automated DLLME implemented on an autosampler platform. DLLME uses a small volume of extraction solvent dispersed into the aqueous sample by a disperser solvent to form a fine emulsion; analytes rapidly partition into the extraction phase, which is subsequently separated and concentrated for direct LC–MS analysis. Key automation features minimize manual intervention and standardize the most error-prone step in PFAS workflows.

Primary methodological highlights:

• Fully automated DLLME using an autosampler to perform extraction, clean-up, and concentration within a single workflow.
• Minimal manual handling — only one manual step remains in the workflow.
• High batch flexibility: the system accommodates small runs up to batches of 54 samples.
• Throughput example: two samples can be prepared in approximately 18 minutes.
• Extremely low solvent consumption and elimination of solid-phase extraction (SPE) cartridges.
• Applicability across a wide range of environmental matrices with reduced matrix interferences.

Poorly Performing Steps Addressed

The workflow explicitly targets the major non-instrumental causes of poor PFAS data quality: inconsistent extraction efficiency, variable clean-up, elevated contamination risk from manual handling, and inadequate chromatographic separation that can compromise confidence in identifications and quantification.

Separation and Detection Strategies

Separation is achieved with a UHPLC system designed for throughput and reproducibility. Two compliant detection strategies are provided so laboratories can choose between a targeted triple-quadrupole approach and a high-resolution accurate-mass (HRAM) full-scan approach depending on regulatory, retrospective-analysis, and throughput needs.

Detection configurations summarized:

• Configuration 1 — Dual-column confirmation with a triple-quadrupole detector. Uses two different column chemistries to provide built-in confirmation without re-analysis, producing a single data file for quantitative regulatory testing and enhanced selectivity.
• Configuration 2 — Flexibility mode with a HRAM Orbitrap detector. Provides full-scan capability, simplified method development, retrospective data mining for newly regulated analytes, and adaptability to emerging PFAS target lists.

Data Analysis and Software

Integrated laboratory software guides routine users through standardized workflows, simplifies training, and ensures traceable processing. The software emphasizes regulatory compliance, unified instrument control, and streamlined data handling so that labs can maintain throughput without sacrificing data integrity.

Used Instrumentation

The workflow integrates automated sample preparation, UHPLC, and MS detection components chosen for routine regulated environments. Representative instrumentation described in the source material includes:

• Automated autosampler configured for DLLME (example: TriPlus RSH SMART Autosampler).
• UHPLC system optimized for throughput and dual-column operation (example: Vanquish Duo UHPLC).
• Triple-quadrupole mass detector optimized for quantitative PFAS work (example: TSQ Altis Plus EFOX Edition).
• High-resolution Orbitrap mass detector for full-scan HRAM and retrospective analysis (example: Exploris EFOX).
• Chromatography and data-management software supporting guided workflows and compliance-oriented data processing (example: Chromeleon).

Main Results and Discussion

Key operational benefits of the automated DLLME workflow include consistent extraction efficiency across analysts and runs, reduced contamination propensity due to minimized manual handling, and cleaner extracts that improve chromatographic performance and reduce matrix effects. Eliminating SPE cartridges lowers consumable costs and environmental footprint while keeping solvent usage minimal.

Performance-focused observations:

• Automation reduces analyst-to-analyst variability and batch failures, increasing reproducibility and defensibility of results.
• Clean DLLME extracts enable accelerated chromatographic methods with reliable separations even under higher-throughput conditions.
• Dual detection paths provide either robust targeted quantitation with built-in confirmation (triple quad + dual columns) or flexible, future-proof HRAM analysis that supports retrospective interrogation.
• Software-guided workflows and single-file data handling simplify compliance and reduce training burden.

Benefits and Practical Use

The integrated workflow suits routine environmental laboratories that require predictable performance, traceability, and the ability to respond to changing regulatory lists. Practical advantages include:

• Lower operational variability and fewer re-analyses.
• Higher sample throughput with minimal increase in hands-on time.
• Reduced consumable and solvent costs relative to traditional SPE-based methods.
• Clear audit trails and standardized processing for regulatory submissions.

Future Trends and Potential Applications

Anticipated developments and opportunities for this approach include:

• Broader adoption of automation to further decouple throughput from personnel constraints and to standardize cross-lab reproducibility.
• Expansion of validated DLLME protocols to additional matrices and extended PFAS target lists as regulations evolve.
• Integration of HRAM workflows for routine retrospective analysis and for rapid response to emerging contaminants.
• Improved software automation, cloud-based data handling, and AI-assisted quality control to accelerate data review while maintaining compliance.
• Miniaturization and greener chemistries to further reduce solvent use and waste generation in high-volume labs.

Conclusion

An automated DLLME-based workflow paired with robust UHPLC separation and selectable MS detection modes addresses the primary practical barriers to dependable routine PFAS analysis: variability in sample preparation, matrix interference, and the need for regulatory confirmation. By combining low-solvent, cartridge-free extraction with compliant detection strategies and guided software, the workflow enhances reproducibility, reduces contamination risk, and supports scalability for evolving regulatory demands.

References

No independent literature references were provided in the source document. Summary based on a Thermo Fisher Scientific application note/brochure describing an automated EFOX Series + DLLME PFAS workflow (document identifier noted in the source material).