Highly selective and sensitive chromium(III) membrane sensors based on a new tridentate Schiff's base

Abstract In order to get a view about the tendency of N -(1-thien-2-ylethylidene)benzene-1,2-diamine (SNS), towards chromium and some other metal ions, theoretical calculations and conductance studies were carried out. Then, a highly selective and sensitive plasticized membrane sensor for chromium(III) ions, based on SNS as membrane carrier, was prepared. The sensor shows a linear dynamic range of 1.0 × 10 −6 to 1.0 × 10 −1  M with a Nernstian slope of 19.9 ± 0.3 mV decade −1 and a detection limit of 7.0 × 10 −7  M (∼40 ppb). It has a fast response time of