Determination of iron(III) concentration in domestic water by square-wave voltammetry method using platinum electrodes

Abstract

Iron (Fe) is one of the most common elements in water resources. When the concentration of iron is higher than the permitted levels, it can damage the water environment and human’s health. In this report, the square-wave voltammetry (SWV) method, using platinum electrodes, has been employed for detecting iron (III) in domestic water. The SWV method gave the best result based on the optimal parameters as follows: working potential from 100 to 900 mV, amplitude of 60 mV, potential step of -2 mV, and frequency of 25 Hz. The linear range was obtained from 0.3 mg·L-1 to 5 mg·L-1 with a correlation coefficient of 0.9986. The detection limit and the quantitation limit were 0.1 mg·L-1 and 0.3 mg·L-1, respectively. These results meet the requirements of the World Heath Organization for Fe(III) concentration in drinking water (0.3 mg·L-1). The platinum electrodes can be applied for the detection of Fe(III) concentration in domestic water via the SWV method