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US EPA broadens scope of PFAS detection method

The US EPA has broadened the scope of a validated test method for detecting per- and poly-fluoroalkyl substances (PFASs) in drinking water to include four more compounds.

EPA Method 537.1 can detect the 'GenX' chemical, hexafluoropropylene oxide dimer acid (HFPO-DA), as well as:

  • 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS);
  • 9-chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS); and
  • 4,8-dioxa-3H-perfluorononanoic acid (ADONA).

These compounds bring the total number it can detect to 18.

PFASs can repel water, grease and oil and are used in a wide range of products, such as food packaging, cookware and clothing.

The EPA will host a free webinar on 28 November at 2:00 pm EDT, to provide further information on the method and its efforts to develop and validate analytical methods more generally.

On 14 November, the agency published its draft reference doses for Gen X chemicals as part of a broader effort to address PFASs.

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