Chromium (III) ion selective electrode based on di(benzylamino)glyoxime

Abstract

A new poly(vinylchloride) membrane sensor for Cr3+ ions based on di (benzylamino)glyoxime as<br />an ionophore was prepared. The electrode has a linear dynamic range 1×10-6-1×10-1 mol l-1,with a<br />Nernstian slope of 20.3 ± 0.5 mV per decade and a detection limit of 2×10-7. It has a fast response<br />time of <15 s and can be used for at least 3 months without any considerable divergence in<br />potential. The proposed electrode revealed good sensitivity for Cr(III) over a wide variety of metal<br />ions and could be used in a pH range of 2-5.5. The proposed sensor was used for the determination<br />of Cr3+ ions in real samples such as tea leaves, coffee and cacao powder by direct potentiometry.