EPA Method 625

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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