EPA Method 624

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EPA Method 624:

A sample is purged with an inert gas transforming the purgeable organics to the vapor phase where it 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 an chromatographic column. The gas chromatograph is temperature programmed to separate the purgeable organics, which are then detected by a mass spectrometer (MS).

This is a GC/MS method that determines the quantity of purgeable organics. This method can also be extended to screen for acrolein (CAS No. 107-02-8) and acrylonitrile (CAS No. 107-13-1), however the preferred method for these two compounds is Method 603.

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

(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 (especially methylene chloride and fluorocarbons) 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 sample 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.



Varies based on analyte and conditions (ug/L).

Sample Prep:

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 three industrial wastewaters spiked at six concentrations over the range 5 to 600 mg/L.

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 a 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 14.1 of the Method.

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

Test Description:

Instrument used for this test: