EPA Method 507
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EPA Method 507:
Determination of Nitrogen- and Phosphorus-Containing Pesticides in Water by Gas Chromatography with a Nitrogen-Phosphorus Detector - Revision 2.1.
A 1 L sample is extracted with methylene chloride by shaking in a separatory funnel or mechanical tumbling in a bottle. The methylene chloride extract is isolated, dried, and concentrated to a volume of 5 mL during a solvent exchange to methyl tert-butyl ether (MTBE). The concentrations of pesticides in the extract are measured using capillary column gas chromatography (GC) system equipped with a nitrogen-phosphorus detector (NPD).
This method determines certain nitrogen- and phosphorus-containing pesticides in ground water and finished drinking water.
Methods for the Determination of Organic Compounds in Drinking Water - Supplement III (EPA/600/R-95-131)
(A) Glassware contamination: Thoroughly clean glassware, including baking or solvent rinse.(B) Reagent contamination: Use high purity reagents.(C) Contamination from sample carryover: Rinsing apparatus with water and purging equipment between analyses can minimize contamination.(D) Matrix interferences: Matrix interferences may caused by contaminants that are coextracted from the sample.(E) Solvents: The same solvent must be used to prepare samples and standards to make sure responses are comparable.
Initial demonstration of laboratory capability (includes analysis of standards), followed by surrogate recoveries, laboratory reagent blanks (LRBs), laboratory fortified samples, laboratory fortified blanks (LFBs), and QC performance samples. A method detection limit (MDL) must also be determined for each analyte.
Maximum Holding Time:
14 days generally (see Sampling Handling for exceptions).
Ranges differ for each analyte depending on matrix and instrumentation.
Precision and accuracy values were determined using data from 7 to 8 replicate analyses of a reagent water sample fortified with the analytes of interest.
MDLs were determined using the standard deviation of 7 or 8 replicate analyses of an analyte-fortified reagent water sample multiplied by the t-value for (# of samples -1) degrees of freedom at the 99% confidence level. Detailed instructions for how MDLs are determined are found at 40 CFR part 136, Appendix B.
Revision 2.1, 1995
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