ASTM D7597-16(2017)

1.1This procedure covers the determination of diisopropyl methylphosphonate (DIMP), ethyl hydrogen dimethylamidophosphate (EHDMAP), ethyl methylphosphonic acid (EMPA), isopropyl methylphosphonic acid (IMPA), methylphosphonic acid (MPA) and pinacolyl methylphosphonic acid (PMPA) (referred to collectively as organophosphonates in this test method) in surface water by direct injection using liquid chromatography (LC) and detected with tandem mass spectrometry (MS/MS) using electrospray ionization (ESI). These analytes are qualitatively and quantitatively determined by this test method. This test method adheres to single reaction monitoring (SRM) mass spectrometry.

1.2This test method has been developed by U.S. EPA Region 5 Chicago Regional Laboratory (CRL).

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

1.4The detection verification level (DVL) and reporting range for the organophosphonates are listed in Table 1. TABLE 1 Detection Verification Level and Reporting Range Analyte ESI Mode DVL (μg/L) Reporting Range (μg/L) Diisopropyl methylphosphonate Positive 1 5-150 Ethyl hydrogen dimethylamidophosphate Negative 0.25 5-150 Ethyl hydrogen dimethylamidophosphate Positive 0.25 5-150 Ethyl methylphosphonic acid Negative 5 50-1500 Ethyl methylphosphonic acid Positive 5 50-1500 Isopropyl methylphosphonic acid Negative 10 50-1500 Isopropyl Methylphosphonic acid Positive 5 50-1500 Methylphosphonic acid Negative 20 100-1500 Methylphosphonic acid Positive 10 50-1500 Pinacolyl methylphosphonic acid Negative 5 50-1500 Pinacolyl methylphosphonic acid Positive 5 50-1500