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- W14664876 abstract "A fractured sandstone aquifer at an industrial site in southern California is contaminated with trichloroethene (TCE) to depths in excess of 244 m. Field monitoring data suggest that TCE is undergoing reduction to cis-DCE and that additional attenuation is occurring. However, vinyl chloride (VC) and ethene have not been detected in significant amounts, so that if transformation is occurring, a process other than reductive dechlorination must be responsible. The overall objective of this study was to evaluate the occurrence of biotic and abiotic transformation processes at this site for TCE, cisDCE and VC. Anaerobic microcosms were constructed with site groundwater and sandstone core samples. C-labeled compounds were used to detect transformation products (e.g., CO2 and soluble products) that are not readily identifiable by headspace analysis. The microcosms confirmed the occurrence of biotic reduction of TCE to cisDCE, driven by electron donor in the groundwater and/or sandstone. VC and ethene were not detected during this part of the study. Following incubation periods up to 22 months, the distribution of C indicated statistically significant transformation of [C]TCE and [C]cis-DCE in live microcosms, to as high as 10% CO2 from TCE and 20% CO2 from cis-DCE. In autoclaved microcosms, significant transformation of [C]TCE and [C]cis-DCE also occurred; although some CO2 accumulated, the predominant C product was soluble and could not be stripped by N2 from an acidic solution (referred to as non-strippable residue, or NSR). Characterization of the NSR by high performance liquid and ion chromatography identified glycolate, acetate and formate as significant components." @default.
- W14664876 created "2016-06-24" @default.
- W14664876 creator A5018758476 @default.
- W14664876 date "2008-01-01" @default.
- W14664876 modified "2023-09-23" @default.
- W14664876 title "LABORATORY EVALUATION of CHLORINATED ETHENE TRANSFORMATION PROCESSES in FRACTURED SANDSTONE" @default.
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