Determination of Cr3 ions in biological and environmental samples by a chromium (III) membrane sensor based on 5-amino-1-phenyl-1H-pyrazole-4-carboxamide

作者：Zamani Hassan Ali^*; Rajabzadeh Ghadir; Masrornia Mahbobeh; Dejbord Azam; Ganjali Mohammad Reza; Seifi Nasim

来源：Desalination, 2009, 249(2): 560-565.

DOI：10.1016/j.desal.2009.01.023

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

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 x 10(-6) and 1.0 x 10(-1) M with a near Nernstian slope of 19.6 /- 0.4 mV per decade, a detection limit of 5.3 x 10(-7) M, a very good selectivity for Cr3 over other cations in a wide pH range (3.2-6.3). Furthermore, the newly-designed electrode presented a fast response time of 10 s with a lifetime of at least 2 months indicating no considerable potential divergence. The sensor accuracy was investigated by the potentiometric titration of a Cr(III) solution with EDTA as well as the monitoring of Cr(III) in mixtures of three and five different ions. 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.

• 出版日期2009-12-15