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Standard Test Method for Determination of Diisopropyl Methylphosphonate, Ethyl Hydrogen Dimethylamidophosphate, Ethyl Methylphosphonic Acid, Isopropyl Methylphosphonic Acid, Methylphosphonic Acid and Pinacolyl Methylphosphonic Acid in Water by Liquid Chromatography/Tandem Mass SpectrometryTranslate name
STANDARD published on 15.6.2017
Designation standards: ASTM D7597-16(2017)
Publication date standards: 15.6.2017
The number of pages: 13
Approximate weight : 39 g (0.09 lbs)
Country: American technical standard
Category: Technical standards ASTM
liquid chromatography, mass spectrometry, organophosphonates,, ICS Number Code 13.060.50 (Examination of water for chemical substances)
|Significance and Use|
5.1 Organophosphate pesticides affect the nervous system by disrupting the enzyme that regulates acetylcholine, a neurotransmitter. They were developed during the early 19th century, but their effects on insects, which are similar to their effects on humans, were discovered in 1932. Some are poisonous and were used as chemical weapon agents. Organophosphate pesticides are usually not persistent in the environment.5.2 This test method is for the analysis of selected organophosphorous-based chemical weapon agent degradation products from Sarin (GB), Soman (GD), Tabun (GA) and VX. This test method has been investigated for use with reagent and surface water.
1.1 This 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.
1.2 This test method has been developed by U.S. EPA Region 5 Chicago Regional Laboratory (CRL).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 The detection verification level (DVL) and reporting range for the organophosphonates are listed in .
TABLE 1 Detection Verification Level and Reporting Range
1.4.1 The DVL is required to be at a concentration at least three times below the reporting limit (RL) and have a signal/noise ratio greater than 3:1. displays the signal/noise ratios at the DVLs for the organophosphonates in the ESI positive mode and in the ESI negative mode.
FIG. 1 Example ESI Positive Mode SRM Chromatograms Signal/Noise Ratios
FIG. 2 Example ESI Negative Mode SRM Chromatograms Signal/Noise Ratios
1.4.2 The reporting limit is the concentration of the Level 1 calibration standard as shown in for the organophosphonates except for MPA in the ESI negative mode which is at Level 2 due to not meeting the DVL criteria at the lower concentration level. The DVL for MPA in the ESI negative mode is at 20 μg/L, which forces a raised reporting limit. However, the multi-laboratory validation required a spike of all target analytes at Level 1 concentrations. The mean recovery for MPA in the ESI negative mode at this level was 98.7 % as shown in . If your instrument’s sensitivity can meet the requirements in this test method, MPA may have a 50 μg/L reporting limit.
TABLE 2 Concentrations of Calibration Standards (PPB)
TABLE 3 Multi-Laboratory Recovery Data in Reagent Water
1.5 This 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 and health practices and determine the applicability of regulatory limitations prior to use.
1.6 This 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.
|2. Referenced Documents|
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