Chromium(III) ion selective electrode based on 2H-1,4-benzothioazine-2,3(4H)dione dioxime as a neutral carrier

Abstract

A poly(vinyl chloride) membrane based on a new a-dioxime derivative as membrane carrier was prepared and<br />investigated as a Cr(III) selective electrode. The electrode exhibits a good potentiometric response for Cr(III)<br />over a wide concentration range 1.0 x 10-6 to 1.0 x 10-1 M with a slope 19.5+0.5 mV/decade and low detection<br />limit of 8.9 x 10-7 M. It has a fast response time < 15 s. The best performance was observed with the membrance<br />having the PVC-ligand-acetophenone-oleic acid composition 6:1:13:1. The proposed electrode works well in a<br />wide p1-1 range 1.5-5.5. The proposed sensor was successfuly used for the determination of Cr(III) ions in<br />samples and real samples and as indicator electrode in potentiometric titration of Cr(III) ion. The application of<br />this electrode for Cr(III) determination in real samples is described. The results obtained with this procedure are<br />in close agreement with those obtained using AA spectrophotometry.