Product Guide for PFAS Analysis

Importance of the Topic

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental pollutants that require highly sensitive and accurate analytical methods. Due to their widespread presence and strong tendency to adhere to materials, PFAS sampling and analysis must minimize background contamination and sample loss. Reliable laboratory supplies and proper system qualification are essential to obtain valid results at trace concentration levels.

Objectives and Study Overview

This product guide outlines best practices and essential lab supplies for PFAS testing in accordance with leading global methods, including EPA 537.1, EPA 533, EPA 8327, ISO 25101, ISO 21675, ASTM D7979, ASTM D7968, and DIN 38407-42. It aims to help laboratories select, screen, and qualify consumables and instrumentation to ensure accurate quantification of legacy, alternative, and ultrashort-chain PFAS across diverse matrices.

Methodology and Instrumentation

• Sample Collection: Use PFAS-free polypropylene vessels to avoid adsorption and contamination during transport.
• SPE Cleanup: Apply Resprep WAX or S-DVB cartridges with validated sorbents under method-specific conditions.
• Chromatography: Integrate PFAS delay columns upstream of Raptor C18 UHPLC columns to trap system-related PFAS and maintain peak integrity.
• Autosampler Preparation: Employ limited-volume polypropylene vials and polyethylene caps free of PTFE-lined components.
• Manifold and Vacuum: Utilize Resprep QR-12/QR-24 manifolds with disposable liners and rocker vacuum pumps for reproducible flow control.
• Filters and Tubing: Install stainless-steel inlet filters and use corrosion-resistant fittings to protect UHPLC systems from particulate matter.

Main Results and Discussion

Evaluating each component prior to analysis ensures blank levels below method detection limits and prevents sample loss due to sorption. Integration of a PFAS delay column consistently eliminates baseline interferences, improving signal-to-noise ratios for trace analytes. Qualification protocols confirm that sorbents, vials, caps, and connectors do not contribute detectable PFAS background.

Benefits and Practical Applications

• Enhanced Accuracy: Pre-screened consumables reduce background noise and avoid false positives.
• Method Compliance: Selected products meet performance criteria of major regulatory standards.
• Operational Efficiency: Water-wettable polymer cartridges and quick-replace manifolds streamline sample preparation and reduce solvent use.
• Versatility: Supplies are compatible with drinking water, wastewater, soil, sediment, biota, and sludge matrices.

Future Trends and Opportunities

Advances in stationary phases and sorbent chemistries will further lower detection limits for emerging ultrashort-chain PFAS. Automation of SPE workflows and integration of online sample cleanup will increase throughput. Additionally, mobile and in situ PFAS detection technologies are expected to complement laboratory-based methods, enabling real-time monitoring in the field. Ongoing harmonization of international regulations will drive demand for standardized, high-purity lab supplies.

Conclusion

Careful selection, screening, and qualification of sampling vessels, SPE cartridges, columns, and accessories are fundamental to robust PFAS analysis. Implementing best practices and using specialized lab supplies minimize contamination and sample loss, ensuring regulatory compliance and data integrity across diverse analytical methods.

Reference

Restek Corporation. Product Guide for PFAS Analysis. 2021.