Accession Number : ADA292875

Title :   Chemical Preservation of Volatile Organic Compounds in Soil Subsamples.

Descriptive Note : Special rept.,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s) : Hewitt, Alan D.

PDF Url : ADA292875

Report Date : FEB 1995

Pagination or Media Count : 13

Abstract : This study evaluated chemical preservation as a means of inhibiting the biological degradation of volatile organic compounds (VOCs) in soil subsamples held for 14 days or longer. Experiments were performed using a soil in which benzene and toluene were found to rapidly biodegrade under aerobic conditions while following protocols consistent with high-level (VOCs at >1 micrograms/g) and low-level (VOCs at <1 micrograms/g) purge-and-trap gas chromatography mass spectrometry and static headspace gas chromatography analysis. Chemical preservation consisted of immersing soil subsamples fortified with trans-1,2-dichloroethylene (TDCE), trichioroethylene (TCE), benzene and toluene in methanol or water acidified to a pH of less than 2 with NaHSO4. These two methods of chemical preservation resulted in stable concentrations of these two aromatic hydrocarbons even when held at room temperature. The two chlorinated hydrocarbons showed stable concentrations with and without chemical preservation. This result, in conjunction with earlier findings, suggests that chemical preservation is more effective at suppressing biodegradation than the current practice of refrigeration (4 deg C).

Descriptors :   *CHEMICALS, *ORGANIC COMPOUNDS, *SAMPLERS, BENZENE, WATER, SPECTROMETRY, ROOM TEMPERATURE, METHANOLS, AROMATIC HYDROCARBONS, VOLATILITY, PRESERVATION, BIODEGRADATION, SOIL TESTS, GAS CHROMATOGRAPHY, CHLORINATED HYDROCARBONS, REFRIGERATION SYSTEMS, BIODETERIORATION, TOLUENES.

Subject Categories : Physical Chemistry
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE