Integrating photoelectrochemical semiconductor sensor for sulphide ion determination

A novel approach to the determination of small amounts of S2- in aqueous so lution based on the photoelectrochemical dissolution of semiconductor metal sulphide deposit arising at the surface of semiconductor electrode via exc hange reaction is proposed. The potentialities of this approach are demonst rated using coulometric CdO-based photoelectrochemical sensor, which operat es in an accumulation mode and exhibits a linear dependence of analytical s ignal (photocharge) on S2- concentration in the range 3.4 x 10(-6) to 4.4 x 10(-9) M. (C) 2001 Elsevier Science B.V. All rights reserved.