Hassan Ali Zamani - Department of Applied Chemistry, Quchan branch, Islamic Azad University, Quchan,
Mahbobeh Masrornia - Department of Chemistry, Mashhad branch, Islamic Azad University, Mashhad
Azam Dejbord - Department of Chemistry, Mashhad branch, Islamic Azad University, Mashhad

A highly Cr3+-selective ionophore, based on 5-Amino-1-phenyl-1H-pyrazole-4-carboxamide (APC) as a carrier, was synthesized in order to obtain a Cr3+ ion-selective electrode. The demonstrated characteristics of the sensor included a linear dynamic range between 1.0 × 10-6 and 1.0 × 10-1 M with a near Nernstian slope of 19.6 ± 0.4 mV per decade, a detection limit of 5.3 × 10-7 M, a very good selectivity for Cr3+ over other cations in a wide pH range (3.2-6.3). As a result, the developed sensor provided satisfactory results after its application in the Cr3+ determination in biological samples (urine and synthetic plasma) and also in wastewater of chromium electroplating industries .

Ion-selective electrode; Chromium (III); Sensors, Poly vinyl chloride membrane; 5-Amino-1-phenyl-1H-pyrazole- 4-carboxamide