Accession Number : ADA195869

Title :   Preliminary Development of a Fiber Optic Sensor for TNT.

Descriptive Note : Special rept.,

Corporate Author : NEW HAMPSHIRE UNIV DURHAM DEPT OF CHEMISTRY

Personal Author(s) : Zhang, Yuke ; Seitz, W R ; Sundberg, Donald C ; Grant, Clarence L

PDF Url : ADA195869

Report Date : Mar 1988

Pagination or Media Count : 20

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. Keywords: Contaminated soils, Fiber optics, Sensor, Trinitrotoluene. (MJM)

Descriptors :   *DETECTORS, *TNT, AMINES, ANIONS, COLORS, CONCENTRATION(CHEMISTRY), CONTAMINATION, DETECTION, DEXTRAN, FIBER OPTICS, GROUND WATER, MATERIALS, MEMBRANES, PH FACTOR, SOILS, SOLUTIONS(MIXTURES)

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE