Techniques of diffuse reflectance and fluorescence spectroscopy have been utilized for the development of new quantitative methods for the analysis of chlorine. The reflectance method involves the use of a dry reagent chemistry, prepared by immobilizing (sigma) -tolidine on a nylon 66 membrane, which is interrogated by means of optical fibers. Chlorine concentrations in the range 0-5 ppm can be measured with a limit of detection of 0.043 ppm. The fluorescence technique is demonstrated by the measurement of quenching of 9-vinylanthracene by chlorine. Efficient quenching of fluorescence of this dye is observed with a Stern-Volmer constant of 8667 M-7. The findings demonstrate the possibility of developing an analytical method for the determination of chlorine based on fluorescence quenching and optical fibers.
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