In situ detection of organic molecules
We have developed a new fluorescence-based chemical indicator for detecting chloroform and trichloroethylene. We have isolated and identified the fluorescent products resulting from this assay using modern spectroscopic techniques. We describe the details of this reaction, its putative reaction sequences with chloroform and trichloroethylene, and present an analysis of the spectral data obtained from the reaction products. We have made preliminary measurements using a fiber optic chemical sensor (optrode) for monitoring groundwater contamination that exploits this new fluorescence-based indicator for chloroform and trichloroethylene. We report details of the sensor configuration and the chemical reagents employed in the transduction chemistry. We have developed for this optrode a technique that permits the selective detection of chloroform in the presence of trichlorethylene and discuss approaches to selectively measure trichloroethylene in the presence of chloroform. The results of preliminary measurements of trichloroethylene with optrodes that contain our new chemical indicator are outlined in this report. We report on the syntheses of several compounds that we will evaluate to improve the luminescence properties of the fluorescence-based test for chloroform and trichloroethylene. 24 refs., 24 figs., 2 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48; AC05-84OR21400
- OSTI ID:
- 6830190
- Report Number(s):
- UCRL-21081; DOE/HWP-66; ON: DE88016646
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
47 OTHER INSTRUMENTATION
CHLOROFORM
DETECTION
ETHYLENE
FIBER OPTICS
USES
GROUND WATER
MONITORING
CARBENES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
FLUORESCENCE
INDICATORS
LUMINESCENCE
MASS SPECTRA
ORGANIC CHLORINE COMPOUNDS
REACTION INTERMEDIATES
SPECIFICITY
YIELDS
ALKENES
CHLORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
HYDROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
RADICALS
SPECTRA
SYNTHESIS
WATER
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)
400201 - Chemical & Physicochemical Properties
440300 - Miscellaneous Instruments- (-1989)