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View Actual EPA Method 625 (PDF File)
EPA Method 625:Semivolatile Organic Compounds by Isotope Dilution GC/MS
Summary:A 1 L aliquot of sample is adjusted to pH >11 and extracted in a separatory funnel with three 60 mL portions of methylene chloride or with 200-500 mL methylene chloride in a continuous extraction apparatus. The pH of the sample is then adjusted to
Scope:This method is applicable to the determination of extractable organics in municipal and industrial discharges.
Citation:EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)
Interferences:(1) Contaminants from glassware.(2) Matrix interferences that are co-extracted with sample.(3) Base/Neutral extraction can result in loss of phenol, 2-methylphenol, and 2,4-dimethylphenol.(4) Resolution of the following compound pairs is not sufficient using the packed columns and conditions described in the method: (a) Anthracene and Phenanthrene (b) Chrysene and Benzo(a)anthracene (c) Benzo(b)fluoranthene and Benzo(k)fluoroanthene.
QC Requirements:reagent blanks (RB), quality control samples (QCS), matrix spikes (MS)
Maximum Holding Time:7 days (prior to extraction) 40 days (after extraction)
Media:WATER
Subcategory:Organic
Concentration:None given.
Precision:The precision and accuracy values were determined using regression equations derived from a 15 laboratory validation study. The study determined analytes using reagent water, drinking water, surface water, and industrial wastewaters with additions at six concentrations over the range 5 to 1300 ug/L. Single operator precision, overall precision, and accuracy were found to be directly related to the concentration of the parameter and essentially independent of the sample matrix.
Detection:MDLs determined per 40 CFR part 136, Appendix B.
Revision Number:40 CFR Part 136, Appendix A (Current Edition)
Test Description:Acids and Base/Neutr
Report Number:/waterscience
Instrument used for this test:GCMS