Standard Test Method for Determination of Pesticides and Polychlorinated Biphenyls (PCBs) in Aqueous Solution by a Tandem Gas Chromatography/Mass Spectrometry/Mass Spectrometry (GC/MS/MS)

Importancia y uso:

5.1 Pesticides and PCBs are Environmental Protection Agency (EPA)-regulated contaminants in treated drinking water, wastewater, and ground water. Liquid-liquid and solid-phase extraction (SPE) are generally applicable procedures for extracting these target analytes before GC/MS/MS analysis.

5.2 This test method is applicable to pesticides that are extracted from aqueous solution using methylene chloride and can be chromatographed and detected using tandem mass spectrometry procedures. In Table 1, pesticides are listed and in Table 2, PCBs validated by this test method are listed. This test method is not limited to the compounds listed in Table 1 or Table 2; however, the applicability of the test method to other compounds shall be demonstrated. Refer to Guide E2857 for guidance in validating the method for additional parameters.

(A) Priority pollutant pesticide listed in Table 1 of Method 608.3.(B) Method 608.3 lists this analyte as heptachlor epoxide, CAS # 1024-57-3.(C) Priority pollutant pesticide listed in Table 1 of Method 608.3. (A) Priority pollutant Aroclor listed in Table 2 of Method 608.3.

5.3 Analyte concentrations up to approximately 250 ng/L may be determined. Higher concentrations may be determined by dilution of the extract. Analytes that are inefficiently extracted from water may not be detected when present at low concentrations.

5.4 Analytes that are not separated chromatographically but that have different transitions can be identified and quantitatively measured.

5.5 This test method may be used to determine the concentrations of Aroclor6 mixtures or PCB congeners or both present in the sample. See Appendix X1 and Appendix X2 for suggested transitions and collisional energies for all 209 congeners. Separation of all 209 congeners may not be possible and may require additional GC columns and operating conditions. Analysis of all congeners is not expected to be achieved by this test method.

5.6 Method detection limits (MDL) and minimum reporting level (MRL) for analytes in Tables 1 and 2 are given in Table 3. The required MDLs and MRLs are identical to those published in Method 608.3.

(A) Priority pollutant listed in Table 1 of EPA Method 608.3.(B) Priority pollutant listed in Table 2 of EPA Method 608.3.

Subcomité:

D19.06

Volúmen:

11.02

Número ICS:

13.060.50 (Examination of water for chemical substances)

Palabras clave:

capillary; congeners; environmental; gas chromatography; mass spectrometry; organic; PCBs; pesticides;