Electrochemical detection of sulphide: a novel dual flow cell

A novel application of a dual flow electrochemical cell to the detection of hydrogen sulphide is presented. The sensor employs the electrochemically i nitiated reaction of N, N-dimethylphenylene-1,4-diamine (DMPD) with sulphid e as the main analytical signal. The redox indicator is passed through one channel while sulphide effluent is flowed through the other with the stream s separated by the use of a gas-permeable membrane. Preliminary results hav e shown that the sensor responds linearly to sulphide over the range 20-103 mu M with the signal profile and response time capable of modulation throu gh variation in the flow rates of the two streams. (C) 2000 Elsevier Scienc e S.A. All rights reserved.