Environ. Sci. Techno/. 1995, 29,769-774
Round=RobinStudy of Performance Evaluation Soils Vapor-Fortified with Volatile Organic Compounds A L A N D . HEWITT*
US.Army Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire 03755-1290 CLARENCE L. GRANT University of New Hampshire, Durham, New Hampshire 03824
Three soils were vapor-fortified with volatile organic compounds (VOCs) to produce materials suitable for performance evaluation and related quality assurance/quality control (Wac)functions. Twelve laboratories analyzed t w o independently prepared sets of three different soil subsamples fortified with trans1,2-dichloroethylene (TDCE), trichloroethylene (TCE), benzene (Ben), and toluene (Tol). Analyte concentration estimates were reported for each soil subsample following a methanol extraction, purgeand-trap gas chromatography/mass spectrometry analysis (Method 8240, SW846). Relative standard deviations within individual soils ranged from 8.5 to 28.2%, with a pooled standard deviation of
