APPLICATION OF DIFFERENTIAL ELECTROLYTIC POTENTIOMETRY FOR DETECTION IN FLOW-INJECTION ANALYSIS

The applicability of differential electrolytic potentiometry as a dete ction system in flow injection analysis is investigated. A computer-co ntrolled injector which delivers precise volumes of sample solutions i n a reproducible manner was developed. Conditions such as current dens ity employed, the concentrations of the solutions used and the flow ra te were optimized. Chloride in water was determined by means of this s ystem. The relation between chloride concentration and the measured si gnal was found to be Nernstian for solutions of concentrations above 6 mu g ml(-1) chloride. For solutions below this concentration, the rel ation is linear. (C) 1998 Elsevier Science B.V.