EPA Method 602

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EPA Method 602:
Purgeable Aromatics

Summary:
A sample is purged with an inert gas transforming the aromatics to the vapor phase which is collected on an absorbent trap at ambient temperature. After the sample is purged, the trap is then heated, backflushed, and desorbed with the inert gas onto a chromatographic column. The gas chromatograph is temperature programmed to separate the aromatics which are then detected by a photoionization detector. Method 624 can be used for GC/MS confirmation of compound match or interference.

Scope:
This method determines target compounds potentially found in municipal and industrial discharges.

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

Interferences:
(A) Impurities in gas and plumbing: Impurities in the inert gas and organic plumbing system of the purge and trap concentrator tend to be the main cause of interference in the analytical system. The use of non-Teflon tubing and fittings should be avoided.(B) Contamination during collection: Samples can become contaminated by diffusion of volatile organic compounds across the septum seal during collection and storage. Use Field Blanks to verify possible contamination.(C) Carryover: Contamination by carry-over in the analytical system can occur, especially in samples that are extremely concentrated. Frequent bakeout and cleaning of the purging system can help prevent carry-over.

QC Requirements:
Initial demonstration of laboratory capability and the periodic analysis of laboratory reagent blanks, fortified blanks, and other laboratory solutions as a continuing check on performance.

Maximum Holding Time:
14 days

Media:
WATER

Subcategory:
Organic

Concentration:
MDL to 1000xMDL (ug/L).

Sample Prep:
None.

Precision:
The precision and accuracy values were determined using regression equations derived from a 20 laboratory validation study.This study determined analytes in reagent water, drinking water, surface water, and three industrial wastewaters spiked at six concentrations over the range 2.1 to 550 mg/L.

Detection:
MDL procedure is equivalent to the procedure at 40 CFR part 136, Appendix B. MDLs were determined using the standard deviation of 7 replicate analyses of an analyte-fortified reagent water sample multiplied by the t-value for 6 degrees of freedom at the 99% confidence level (3.14). Detailed instructions for how MDLs are determined are found in Section 12.1 of the Method.

Revision Number:
40 CFR Part 136, Appendix A (Current Edition)

Test Description:
Benzene, Chlorobenze

Instrument used for this test:
GC