Development of Chromium(III)‎ Selective Potentiometric Sensor by Using Synthesized Triazole Derivative as an Ionophore

Abstract EN

A new poly(vinyl chloride) membrane based electrochemical sensor containing synthesized triazole compound, that is, bis-(4-N-amino-5-mercapto-1,2,4-triazol-3-yl)alkane (BAMTA) as an electroactive material was prepared and investigated as a chromium(III) selective sensor.

The optimum composition of the best performing membrane contained triazole, sodium tetraphenylborate (NaTPB), nitrophenyl octyl-ether (NPOE), and polyvinyl-chloride (PVC) in the ratio 10 : 2 : 50 : 38 w/w.

The sensor exhibited near Nernstian slope of 19.8±0.2 mV/decade of activity in the working concentration range of 1.0×10−5−1.0×10−1 M.

It displayed a stable potential response in the pH range 3.4–5.2.

The sensor exhibited a fast response time of less than 10 s and could be used for at least 6 weeks without any considerable divergence in potentials.

The proposed sensor showed very good selectivity over most of the common cations including Li+, K+, Na+, Ni2+, Co2+, Cu2+, Sr2+, Ba2+, Cs+, Pb2+, Zn2+, Mg2+, Cd2+, Al3+, Fe3+, and La3+.

It could be employed successfully for the determination of Cr(III) ion activity in electroplating and leather tanning industry wastes.