DISPOSABLE OPTOCHEMICAL SENSOR FOR THE DETERMINATION OF CHLORINE CONCENTRATIONS IN THE PPB-RANGE

An optochemical sensor for the determination of chlorine concentration s has been developed by immobilizing the redox indicator 4,4'-diamino- 3,3'-dimethylbiphenyl (o-tolidine) in a silicone-polycarbonate copolym er membrane. Disposable sensors were obtained by coating small glass s heets with thin films of the dye containing membrane. The determinatio n of chlorine concentrations between 0.05 and 5.0 ppm has been carried out. By this a calibration plot with a linear correlation between the chlorine concentrations and the respective sensor responses was obtai ned. The time for the analysis of the sensor response has been minimiz ed by the application of a kinetical interpretation method. (C) 1997 E lsevier Science S.A.