Analysis of PFAS in Non-Potable Water by Co-Solvation with Methanol Followed by Tandem LCMS

Polyfluoroalkyl Substances (PFAS) in the Environment - Session 2
Oral Presentation

Prepared by W. Lipps, B. Prakash
Shimadzu Scientific Instruments, 7102 Riverwood Dr, Columbia, MD, 21046, United States

Contact Information: [email protected]; 410-862-1759


Perfluorinated Alkyl Substances (PFAS), are man-made compounds known in the media as “forever chemicals”. Although there are nearly 5000 of these compounds manufactured since the 1940’s, there are very few published analytical methods, and none approved for EPA reporting at the national level. Several states have regulated PFAS in drinking water by EPA Method 537 v 1.1 or Method 537.1, however, these methods are not generally suitable for the analysis of non-potable water. In 2015, ASTM International published ASTM D7979, for the analysis of PFAS in non-potable water samples. This method extracts PFAS by co-solvation with methanol and measures targeted compounds using tandem liquid chromatography mass spectrometry. Since the publication of this international standard there have been many comments regarding the method, ranging from applicability to matrices, detection limits, lack of solid phase extraction, and calibration model. This presentation covers, for the first time, numerous comments brought to the attention of ASTM Committee D19 on water, presents some of the ruggedness data, demonstrates why certain facets of the method were chosen, and finally compares results with other methods.