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

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