ASTM D8535-23

1.1This test method covers the determination of per- and polyfluoroalkyl substances (PFAS) in soil/biosolid matrices by solvent extraction, filtering, separation using liquid chromatography (LC), and detection with tandem mass spectrometry (MS/MS). These analytes are extracted from soil/biosolids with basic water and methanol then qualitatively and quantitatively determined by this test method. Quantitation is by selected reaction monitoring (SRM), sometimes referred to as multiple reaction monitoring (MRM).

1.2The reporting limit (RL) and reporting range (see Note 2) for the target analytes are listed in Table 1. The reporting limit is calculated from the concentration of the Level 1 calibration standard as shown in Table 5 for the PFAS after taking into account a 2 g sample weight and a final extract volume of 10 mL, 50 % water/50 % MeOH with 0.1 % acetic acid. The final extract volume is assumed to be 10 mL because 10 mL of 50 % water/50 % MeOH with 0.1 % acetic acid was added to each soil sample and only the liquid layer after extraction is filtered, leaving the solid and any residual solvent behind. Sporadic PFAS hits due to PFAS contamination in consumables/collection tools used during sample collection and preparation is possible while executing this standard and must be monitored. All samples should be taken at a minimum as duplicates in order to compare the precision between the two prepared samples to help ensure the concentration/positive result is reliable.

1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.