What’s in Your Brew? Detecting Volatile PFAS with Headspace SPME GC/MS/MS

Importance of the Topic

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental pollutants associated with adverse health effects. Their presence in widely consumed beverages such as beer poses a potential exposure risk. A reliable analytical approach for screening trace-level volatile PFAS in complex beer matrices is essential to safeguard consumer safety and meet regulatory demands.

Study Objectives and Overview

This study develops and validates a headspace solid-phase microextraction coupled with triple quadrupole gas chromatography–mass spectrometry (HS-SPME GC/MS/MS) method using the Shimadzu GCMS-TQ8040 NX system. The primary goal is to achieve accurate, sensitive quantitation of ten volatile PFAS in various beer types, offering a workflow that could extend to other alcoholic and non-alcoholic beverages.

Methodology and Instrumentation

The analytical workflow comprises:

• Standards and Reagents: Target analytes include fluorotelomer iodides, acrylates, methacrylates, fluorotelomer alcohols, and perfluoroalkane sulfonamides. Corresponding isotopically labeled internal standards were prepared in methanol (10 mg/L) and stored at 4 °C.
• Sample Preparation: 10 mL aliquots of beer or reagent water were spiked with internal standards, fortified for QC, salted to 2% NaCl, vortexed, and subjected to HS-SPME.
• HS-SPME GC/MS/MS Conditions: Shimadzu GCMS-TQ8040 NX with AOC-6000 Plus autosampler and DVB/CAR/PDMS fiber. MRM acquisition with carrier gas helium, splitless injection, and a 30 m SH-I-624Sil MS column. Extraction at 50 °C for 30 min, desorption at 240 °C.
• Calibration and Quality Control: Calibration range 1–2000 ng/L (R² ≥ 0.996). Initial and continuing calibration verifications (ICV, CCV) and laboratory control samples (LCS) ensure accuracy (70–130% recovery) and precision (≤ 20% RSD).

Main Results and Discussion

Key performance outcomes include:

• Calibration Linearity: All analytes exhibited R² ≥ 0.996 over 1–2000 ng/L.
• QC Recoveries: ICV and CCV recoveries met 70–130% criteria. LCS recoveries ranged 91–101% with RSD 0.9–6.5%.
• Beer Sample Analysis: Five beer variants showed mean recoveries of 78–126% and RSD < 8% when using compound-specific labeled standards.
• Internal Standard Selection: Accurate correction of matrix effects required matching each PFAS analyte to its isotopic internal standard, as demonstrated for 8:2 FTMAC.

Benefits and Practical Applications

The proposed HS-SPME GC/MS/MS workflow offers:

• High sensitivity and selectivity with low limits of quantitation.
• Minimal sample preparation and automated handling to reduce errors.
• Complementary use with LC/MS methods to cover a broad PFAS profile in beverages.
• Rapid throughput suitable for routine monitoring in quality control laboratories.

Future Trends and Applications

Opportunities for further development include:

• Expansion of commercially available isotopically labeled PFAS standards.
• Adaptation of the method to additional beverage and food matrices.
• Integration of advanced automation and data analysis tools.
• Broader target lists encompassing emerging PFAS chemicals for comprehensive safety screening.

Conclusion

The HS-SPME GC/MS/MS method on the Shimadzu GCMS-TQ8040 NX delivers a robust solution for quantifying volatile PFAS in beer. It meets stringent QC criteria for accuracy and precision, streamlines sample preparation, and supports routine surveillance of PFAS contamination in complex beverage matrices.

References

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