LCMS Group Leader
Ph. D in chemistry. Currently working at NSF international.
Certifying removal of PFOA/PFOS from drinking water
PFOA/PFOS are the most studies PFAS, which are persistent environmental contaminants. PFOA/PFOS are used in the production of many consumer products as non-stick coatings, surfactants, and for stain and water resistance coatings. Such global widespread use of PFOA/PFOS over many decades has led to their release into the environment. Their chemical properties make them bioaccumulative and the substances are found in various water supplies. PFOA/PFOS may not be removed adequately by the municipal water treatment facility systems. NSF International published standard NSF/ANSI 53-2018 to establish requirements for drinking water treatment systems designed to evaluate the effectiveness for reducing PFOA/PFOS along with a number of other contaminants. NSF developed and validated a large volume direct injection method based on ASTM 7979-17 for the analysis of PFOA/PFOS in drinking water. This analysis was performing using a Waters Acquity UPLC I-class fitted with PEEK solvent lines and interfaced with a Waters Xevo TQ-micro S triple quad mass spectrometer using the multiply reaction monitoring (MRM) technology in negative mode. The reporting level of PFOA/PFOS is 20 ppt.