Construction of Chromium Potentiometric Sensor by using N-banzoyl-N′(6-methyl-2-pyridyl) thiourea as an Excellent Ionophore

Ion potentiometric sensors are playing an important role in environmental analysis because of their simplicity and rapidity. In this study, a potentiometric liquid membrane sensor for simple and fast quantification of chromium in various samples was made. Nbanzoyl- N′(6-methyl-2-pyridyl) thiourea was selected as a sensing material in the organic phase of the PVC membrane. The wide linear range (10-6-10-1 mol L-1), low detection limit (3.0×10-7 mol L-1), and fast response time (~5 s) are the characterizations of this electrochemical sensor. The effects of some factors such as internal solution, pH, life time and selectivity were investigated. Finally, it was used for direct determination of chromium and as an indicator electrode in potentiometric titration of chromium ion.