In-situ headspace analysis
- Holguin, Fahan and Associates Inc., Ventura, CA (United States)
Soil at most of the hazardous waste release sites in the US are contaminated with volatile organic compounds (VOCs), including hydrocarbons and chlorinated solvents. A technique called in-situ headspace analysis (ISHA) (patent pending) has been developed that uses soil vapor sampling for the in-situ quantification of VOCs concentrations in soil. Many studies have shown that static headspace analysis of VOCs produces analytical results comparable to other techniques such as purge and trap. The ISHA procedure is essentially a static headspace analysis conducted in situ that has been calibrated to the site-specific soils. The procedure consists of initially surveying and sampling the on-site soils and preparing site- and soil-specific calibration curves for each analyte of interest. Once this background information has been determined, a systematic collection and analysis of soil gas samples from the subsurface soil pore spaces is undertaken. The concentration of each analyte of interest in each soil vapor sample is determined. Other relevant information includes soil type, depth, and coordinates (x,y) of the soil vapor sample. The concentration of the analytes in the soil pore spaces is then utilized along with the appropriate calibration curves and correction factors to determine the total concentration of VOCs in the subsurface soils. ISHA can best be conducted through integration with a cone penetrometer testing rig which can simultaneously collect the soil vapor samples and determine the soil type and depth off soil vapor sample collection.
- OSTI ID:
- 122449
- Report Number(s):
- CONF-9510211-; ISSN 0017-467X; TRN: IM9547%%29
- Journal Information:
- Ground Water, Vol. 33, Issue 5; Conference: 1995 Association of Ground Water Scientists & Engineers (AGWSE) educational program, Indianapolis, IN (United States), 28-30 Oct 1995; Other Information: PBD: Sep-Oct 1995
- Country of Publication:
- United States
- Language:
- English
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