Instrumentation for the detection of halocarbons in ground water. Final report, January 1, 1989 to December 31, 1989. Draft report
An instrumentation strategy has been identified for eventually achieving the reliable and quantitative detection of trace halocarbons in groundwater samples. The instrumentation approach relies upon the initial photoelectrochemical (PEC) degradation of the halocarbon to be detected, immediately followed by its potentiometric electrochemical detection as chloride species. Initial PEC degradation of trace halocarbons was achieved using illuminated n-TiO2 (anatase). Two illumination sources (365 and 254nm) were simultaneously used to promote electron excitation from the anatase valence to conduction band to obtain comparative halocarbon degradation rates. PEC degradation rates for the halocarbons trichloroethylene (TCE) and vinyl chloride (VC) were found to progressively decrease with time. The observation suggested that the initial halocarbon concentration, prior to the inception of PEC degradation, might be determined from the measured degradation rate after a defined photolysis time. The expectation was confirmed by comparing halocarbon degradation rates for simulated contaminated groundwater containing known amounts of halocarbons. As might be expected, PEC degradation rates for halocarbons occurred more rapidly at shorter wavelengths. Such differences in photodegradation rates suggested a means of differentiating between these two halocarbons.
- Research Organization:
- Eltron Research, Inc., Aurora, IL (United States)
- OSTI ID:
- 7174969
- Report Number(s):
- PB-92-205806/XAB; CNN: GRI-5089-260-1800
- Resource Relation:
- Other Information: Sponsored by Gas Research Inst., Chicago, IL
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHLORINATED ALIPHATIC HYDROCARBONS
CHEMICAL ANALYSIS
GROUND WATER
CONTAMINATION
MEASURING INSTRUMENTS
PERFORMANCE TESTING
VINYL CHLORIDE
CALIBRATION
ELECTROCHEMISTRY
SIMULATION
TRACE AMOUNTS
WATER POLLUTION
CHEMISTRY
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
TESTING
WATER
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)