Preparation and analysis of dry VOC-fortified soils
- Lockheed Environmental Systems and Technologies Co., Las Vegas, NV (United States)
- Environmental Protection Agency, Las Vegas, NV (United States)
Studies were performed to assess the practicality of using dry VOC-fortified soils as performance evaluation materials (PEMs) and also to compare the effectiveness of EPA`s low- and high-level purge-and-trap procedures. Desiccator-dried soils were fortified in large batches with a combination of eight neat VOCs at 1,000 ng each VOC/g soil. Three studies were performed on each of three soil types, namely, Hayesville, Kyle and Charleston. VOC recoveries by the high-level procedure were good to excellent for all soils and compounds and only fair by the low-level procedure. The mean relative standard deviation for all soil/compound/procedure combinations in the first study was 11%. Soil and compound properties influenced the VOC recoveries and rates of vapor losses from dry VOC-fortified soils. The poorest recoveries by the low-level procedure occurred on the soil with the highest proportion of organic matter. Rapid volatilization losses of 1,1,1-trichloroethane, benzene, trichloroethene, toluene, and tetrachloroethene were observed from 1-g samples of Kyle soil. In contrast, only trichloroethene was observed to volatilize from the Hayesville soil and no decreases in VOC concentrations were observed on the Charleston soil from 1-g samples that sat open for 20 min. No volatile losses were observed from any of the soils when dry 20-g soil samples were left open for 20 min.
- OSTI ID:
- 516778
- Report Number(s):
- CONF-9404330--; ISBN 0-8031-2048-6
- Country of Publication:
- United States
- Language:
- English
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