Reduction of hexachloroethane and carbon tetrachloride at surfaces of biotite, vermiculite, pyrite, and marcasite. Book chapter Apr 88-Apr 90
Contamination of groundwater resources by halogenated compounds spurred the formation of a national program to clean up hazardous waste sites across the United States. Compounds such as carbon tetrachloride (CTET), chloroform (CF), and hexachloroethane (HCA) are a few of the chemicals which have been proposed to be 'characteristic' hazardous wastes to be included in the toxic contaminant leachate potential (TCLP) test. Consequently, chemical and biological transformation pathways are being studied to aid in understanding the fate of these contaminants in groundwater environments and to apply the processes occurring naturally in groundwater environments to remediation technologies. Environmental factors significantly affect the transformation rates and the pathways of halogenated aliphatic compounds. The authors have studied the transformation of tetrachloromethane (CTET), and hexachloroethane (HCA) in homogenous and heterogenous systems designed to simulate groundwater and sediment conditions. The laboratory studies were aimed at (1) identifying the sediment components which may act as reducing components and (2) quantifying the environmental factors which govern the transformation rates. Both model and natural systems were studied. Their data indicate that the humic acid fraction in combination with sulfide and Fe(2+) may promote transformation rates. Similarly, surfaces of sheet silicates, such as biotite and vermiculite, were found to promote degradation of CTET and perchloroethylene, respectively.
- Research Organization:
- Stanford Univ., CA (United States). Dept. of Civil Engineering
- OSTI ID:
- 5934750
- Report Number(s):
- PB-92-113141/XAB; CNN: EPA-R-814823
- Resource Relation:
- Other Information: Pub. in Organic Substances and Sediments in Water, v2 p349-364 1991. Sponsored by Robert S. Kerr Environmental Research Lab., Ada, OK
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CARBON TETRACHLORIDE
WATER POLLUTION CONTROL
CHLORINATED ALIPHATIC HYDROCARBONS
GROUND WATER
CONTAMINATION
SEDIMENTS
BIODEGRADATION
ENVIRONMENTAL EFFECTS
HAZARDOUS MATERIALS
MARCASITE
PYRITE
VERMICULITE
WASTE DISPOSAL
CHEMICAL REACTIONS
CONTROL
DECOMPOSITION
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MANAGEMENT
MATERIALS
MICA
MINERALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
SILICATE MINERALS
SULFIDE MINERALS
WASTE MANAGEMENT
WATER
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology