A FiberOptic Sensor for the Continuous Monitoring of Chlorinated Hydrocarbons.
Milanovich-FP; Daley-PF; Langry-K; Colston-BW Jr.; Brown-SB; Angel-SM
NIOSH 1991 Feb:43-47
A fiber optic chemical sensor was developed based on the quantitative, irreversible, chemical reaction that forms visible light absorbing products. The chemical sensor was based on the reaction of basic pyridine with certain chlorinated compounds to form an intense red color. The principles of the existing single measurement sensor technology were discussed. Field test data results using the fiber optic chemical sensor were presented. The sensor has applications in groundwater and vadose zone monitoring. A continuous measurement sensor was also developed. The system was evaluated against gas chromatography for the monitoring of trace levels of trichloroethylene (79016) and chloroform (67663) in groundwater and the vadose zone. Excellent agreement was obtained between the gas chromatographic and fiber sensor determinations with nearly all values within the variance of the gas chromatography. In the vadose zone monitoring studies, the gas chromatographic equipment was at the limit of detection, while the fiber sensor readily made a successful measurement.
Chemical-agent-detectors; Chromatographic-analysis; Organic-vapors; Environmental-pollution; Monitoring-systems; Chlorinated-hydrocarbons;
Field Screening Methods for Hazardous Wastes and Toxic Chemicals. Second International Symposium, February 12-14, 1991. Sponsored by U.S. EPA; U.S. DOE; U.S. Army Toxic and Hazardous Materials Agency; U.S. Army Chemical Research Development and Engineering Center; U.S.A.F.; Florida State Univ.; National Environmental Technology Applications Corp.; and NIOSH