Comparison of perchloroethylene extraction techniques in soil gas survey quantification |
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Authors: | B Zdravkov M Kubal J Janků |
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Institution: | (1) Department of Environmental Chemistry, Institute of Chemical Technology Prague, 166 28 Prague 6, Czech Republic |
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Abstract: | Subsurface pollution by volatile organic compounds has emerged as a widespread problem in industrialized countries. This study
compares static headspace technique and methanol extraction/purge-and-trap analysis followed by thermal desorption/gas chromatography
in attempts for quantification of gas survey results in the determination of these chemicals in soil. Several soils were contaminated
with aqueous solution of perchloroethylene (PCE) (140 mg L−1) using a vapor treatment method. Soil spiking took place up to 24 h in desiccator by exposing individual soil samples contained
in open 40 mL glass vials to PCE evaporated from the solution. After exposure the samples were stored and analyzed within
2 days. The achieved results strongly suggest that gas extraction can provide quantitative results, regarding PCE concentration
in soils, which are not significantly different from liquid based extraction analysis.
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Keywords: | Soil PCE VOCs Extraction Gas survey Vapor contamination |
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