HYDROFLUORIC ACID ANALPURE®

Significance of the Topic

Hydrofluoric acid is a critical reagent in semiconductor fabrication, etching, and various metal processing operations. Ensuring its high purity and precise concentration is essential to maintain process performance and protect equipment and personnel. Precise quantification of trace metal contaminants also prevents unintended side reactions and device defects.

Objectives and Study Overview

The Certificate of Analysis provides a detailed verification of the composition and purity of a commercial hydrofluoric acid batch (SAc0091, batch 4023). The main goals are to confirm the acid concentration, assess common ionic impurities, and screen for a broad spectrum of trace metals at sub-ppm and ppb levels.

Methodology and Instrumentation

Major quality attributes were determined by accepted titrimetric and colorimetric methods, including:

• Assay of acid concentration by acid-base titration calibrated to 50 percent mass fraction.
• APHA colorimetry to quantify color units below ten APHA.
• Ion chromatography or silver coulometry for halide analysis to confirm chloride below four ppm.
• ICP-MS or ICP-OES for multielement trace screening, achieving detection limits in the sub-ppb to low ppb range.

Main Results and Discussion

The product meets all specified quality criteria:

• Hydrofluoric acid concentration at 50 percent meets label claim.
• Color and major anionic impurities remain minimal, with APHA color below ten and halides under specified ppm thresholds.
• Trace elements across a panel of more than fifty metals are at or below detection limits, confirming effective purification and bottling controls.
• Notes highlight potential minor increases in elements such as calcium, sodium, iron, aluminum, and zinc over time in polyethylene containers.

Benefits and Practical Applications of the Method

The rigorous analytical approach ensures reliable supply of high purity hydrofluoric acid for sensitive applications. Low impurity levels protect advanced materials in microelectronics and reduce corrosion risks. The documented profile also facilitates regulatory compliance and quality assurance in production and quality control laboratories.

Future Trends and Possibilities for Application

Emerging techniques such as real-time process monitoring with online spectroscopy and enhanced sensitivity of single-particle ICP-MS will further improve detection of ultratrace contaminants. Advanced container materials and in situ purification systems may reduce storage-related metal leaching and extend reagent shelf life.

Conclusion

This Certificate of Analysis confirms that the examined hydrofluoric acid batch meets stringent purity requirements. The combination of titrimetric, colorimetric, and ICP-based methods provides a comprehensive quality profile essential for critical industrial and research uses.

Reference

Analytika, spol. s r.o. Certificate of Analysis for Hydrofluoric Acid Analpure SAc0091, Batch 4023, dated 10 February 2023.