Potentiometric Chromate Quanti cation Based on Interaction with N, N' Butylen Bis (Saliciliden Iminato) Copper (II)

Abstract

A new chromate-selective electrode, based on the N, N' butylen bis (saliciliden iminato) copper (II) complex as the membrane carrier, was developed. The electrode exhibited a good Nernstian slope of ????28:8 0:5 mV/decade and a linear range of 3:0 10????6 ???? 1:0 10????1 mol.L????1 for chromate. The limit of detection was 3:0 10????6 mol.L????1. It had a fast response time of 5-10 sec and could be used for more than three months. The selective coe cients were determined by the Fixed Interference Method (FIM). A chromate-selective electrode could be used in the pH range of 6.5-10.5. It was employed as an indicator electrode for the direct determination of chromate in real samples.