Accession Number : ADA191322

Title :   A New Fiber-Optic-Based Ion Sensor.

Descriptive Note : Technical rept.,

Corporate Author : INDIANA UNIV AT BLOOMINGTON DEPT OF CHEMISTRY

Personal Author(s) : Bright, Frank V ; Poirier, Greg M ; Hieftie, Gary M

PDF Url : ADA191322

Report Date : 15 Feb 1988

Pagination or Media Count : 28

Abstract : A fluorimetric fiber-optic-based ion sensor has been developed that employs rhodamine 6G hydrophobically and electrostatically trapped on a Nafion film. The sensor is based on the measurement of quenching or enhancement of rhodamine 6G fluorescence by various ions. It was found that ions like Co(II), Cr(III), Fe(II), Fe(III), Cu(II), Ni(II) and NH4+ rapidly quench the rhodamine 6G fluorescence at an initial rate that depends on the ions concentration. This quenching is then readily reversed by the addition of reverser ions concentration. This quenching is then readily reversed by the addition of reverser ions like H+, Li+, Na+, K+, Ba(II), Ca(II), Mn(II), Zn(II) and Mg(II). Again, the initial rate for the attainment of the original fluorescence was found to depend on the reverser ion's concentration. Therefore, by monitoring the quenching directly the concentration of quencher ions can be determined. In addition, by loading the film with quencher and monitoring the initial rate of return toward the original baseline signal one can quantitate non-quenching ions. Keywords: Fiber optics; Sensors; Remote sensing; Ion measurement.

Descriptors :   *DETECTORS, *FIBER OPTICS, *IONS, BASE LINES, FLUORESCENCE, MEASUREMENT, QUENCHING, REMOTE DETECTORS, REVERSIBLE, SIGNALS

Subject Categories : Optics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE