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EPA (ENVIRONMENTAL PROTECTION AGENCY) METHOD STUDY 29, METHOD 624--PURGEABLES
Citation:
EPA (ENVIRONMENTAL PROTECTION AGENCY) METHOD STUDY 29, METHOD 624--PURGEABLES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-84/054.
Description:
The work which is described in the report was performed for the purpose of validating, through an interlaboratory study, Method 624 for the analysis of the volatile organic priority pollutants. This method is based on purging and concentration of the various analytes on an adsorbent followed by thermal desorption onto a gas chromatographic column. A low resolution mass spectrometer serves as the measuring device. Participating laboratories were selected based upon technical evaluation of proposals and upon the analyses results of prestudy samples. The laboratories were supplied with ampuls containing various concentrations of the pollutant compounds. These solutions were aliquoted into four different water types which were subsequently analyzed according to the appropriate methods. In addition to the sample concentrates, each laboratory was supplied with an industrial effluent which was known to contain various pollutants and which was used to estimate false positive and false negative data. The data obtained from the interlaboratory study were analyzed employing a series of computer programs known as the Interlaboratory Method Validation Study (IMVS) system which was designed to implement ASTM procedure D2777.