Flow cell studies with immobilised reagents for the development of an optical fibre sulphide sensor

Abstract

Several reagent systems, such as 2,6-dichlorophenolindophenol, phenanthroline complexes and dithiofluorescein complexes, have been immobilised on polymeric solid supports and their suitability as interphases in optical fibre sensors for sulphide ions investigated. These studies were carried out in a flow cell arrangement. The reflectance of the reagent phase was measured using optical fibres and was found to be related to the concentration of the sulphide ions in the solution. The dynamic range for sulphide ion determination varied with the reagents. The reagent phases prepared from 2,6-dichlorophenolindophenol and from the complex formed by dithiofluorescein with o-hydroxymercuribenzoic acid could be regenerated and are considered suitable for the development of an optical fibre sensor for sulphide ions.