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DETERMINATION OF VOLATILE ORGANIC COMPOUNDS IN SOILS USING EQUILIBRIUM HEADSPACE ANALYSIS AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY
Citation:
Flores, P. AND T. Bellar. DETERMINATION OF VOLATILE ORGANIC COMPOUNDS IN SOILS USING EQUILIBRIUM HEADSPACE ANALYSIS AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/032 (NTIS PB93155992), 1993.
Description:
Existing methods for determination of volatile organic compounds (VOCs) in soil matrices using the purge and trap technique with gas chromatography/mass spectrometry (GC/MS) have several problems, which include preserving sample integrity from collection to analysis and efficiently extracting a broad spectrum of VOCs from the soil matrix. his investigation was undertaken using the Tekmar 7000 headspace autosampler to evaluate its ability o resolve these problems. he objective of this study was to optimize analytical conditions and then to study the efficiency of the headspace technique to extract VOCs from soils. ariations of sample preparation procedures were studied, and method analytes were identified and measured using internal standard calibration GC/MS. sing these data, relative standard deviations and percent recoveries are reported for 59 analytes in four different types of soil matrices; sand, clay, garden soil, and hazardous waste landfill soil. he most accurate and precise results are obtained with sand. ethod detection limits (MDLs), ranging from 0.2 to 7.9 ug/kg were calculated for all analytes (Table 47), using results of replicate analyses of sand, the matrix that had the least matrix effect. t is concluded that the 7000-HA headspace analyzer can be used to determine VOCs in soils.
