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Title: Preliminary development of a fiber optic sensor for TNT
Authors: University of New Hampshire. Dept. of Chemistry.
U.S. Army Toxic and Hazardous Materials Agency.
Zhang, Yuke
Seitz, W. Rudolf
Sundberg, Donald C.
Grant, Clarence L.
Keywords: Contaminated soils
Fiber optics
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 88-4.
Description: Special Report
Abstract: Research aimed at the development of a fiber-optic based sensor is described for in-situ detection of TNT in groundwater. Three approaches were evaluated in depth. All three involved use of a material to concentrate TNT in the field of view of an optical fiber. The materials tested were 1) a concentrated dextran solution isolated by a semi-permeable membrane; 2) a pre-swollen cross-linked polyvinyl alcohol polymer; and 3) an amine-loaded PVC membrane. Another approach based on the formation of a colored-TNT anion at high pH was also considered. The amine-loaded PVC membrane appears to have the most promise. Clear membranes were prepared which reacted with TNT to form a colored product. Measurement is made at 520 nm which is very convenient for fiber optic-based sensing. Various primary amines were assessed.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Special Report

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