DUVAS fiberscope for in situ groundwater monitoring.

摘要

This paper discusses the Department of Energy (DOE) Real-Time Subsurface Monitoring Workshop held in Dallas, Texas. The project objective is to develop a rapid and reliable method for measuring the spatial and temporal distribution of organic solvents and fuel contaminants in groundwater on the Oak Ridge Reservation. One strategy for meeting this need is development of in situ sensors which respond to specific contaminants or classes of contaminants. Because of its proven ability to detect compounds such as benzene and its derivatives, which are common solvents and components of fuels, derivative ultraviolet absorption spectrometry (DUVAS) is being developed for in situ detection of aromatic pollutants. A prototype DUVAS fiberscope has been constructed and tested for groundwater analysis. An important component of the fiberscope is a rugged, down-well prove with a unique ''detector-in-head'' design that increases the maximum depth of subsurface detection. Results comparable to those obtained with a conventional laboratory spectrometer have been achieved with optical fiber lengths up to 50 meters. 9 figs., 2 tabs.