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.