EPA Method 607

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EPA Method 607:

A measured volume of sample is extracted with methylene chloride. The methylene chloride extract is washed with dilute HCl and concentrated to a volume of 10 mL or less. After the extract has been exchanged to methanol it is separated by GC and the parameters are measured with a nitrogen-phosphorus detector.

This is a gas chromatographic (GC) method applicable to the determination of N-Nitrosodimethylamine, N-Nitrosodiphenylamine, and N-Nitrosodi-n-propylamine in municipal and industrial discharges as provided under 40 CFR 136.1.

EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

(A) Glassware: Must be scrupulously cleaned. Solvent rinsing should be followed by detergent washing with hot water, and rinses with tap water and distilled water. Glassware should then be drained dry and heated in a muffle furnace at 400oC for 15-30 minutes. Solvent rinses with acetone and pesticide quality hexane may be substituted for the muffle furnace. Store glassware inverted or capped with aluminum foil.(B) Co-extraction: The extraction process will sometimes extract certain analytes that may cause possible interference with the target compounds. A Florisil cleanup procedure is described in Section 11 of the method.(C) Care must be exercised in the heating or concentrating of solutions containing N-Nitrosodiphenylamine in the presence of reactive amines due to the potential for transnitrosation reactions.

QC Requirements:
Initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality.

Maximum Holding Time:
Extract within 7 days of collection.Analyze within 40 days of extraction.




The method detection limit (MDL) is defined as the minimum concentration of a substance that can be measured and reported with 99% confidence that the value is above zero. The MDL concentrations in Table 1 of the method were obtained using reagent water, however, similar results were achieved using representative wastewaters. The MDL actually acieved in a given analysis will vary depending on instrument sensitivity and matrix effects.

Revision Number:
40 CFR Part 136.3, Appendix A (Current Edition)