Abstract
A new method for sulfide determination is described in which its reaction with N,N-dimethyl-p-phenylenediamine immobilized on a solid support yields methylene blue. The reaction takes place on the cationic exchange resin Dowex 50-X8, and light reflected from the sample is focused through an optical fiber system. Because of the irreversibility of the process, an optical cell rather than a sensor was chosen to monitor the methylene blue concentration. Up to 0.06 ppm sulfide, a linear calibration graph is obtained, although strict adherence to conditions is required to attain reproducible results.
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