Estimating Arsenic Contamination in some Environmental Samples Using Potential Titration by Applying New Technical and Analytical Conditions

Abstract

In this research, a potential method was developed by choosing new technical and analytical conditions to determine arsenic by titrating it with iodine on a platinum electrode directly in aqueous media, and then applying it to some environmental samples.

The study showed that the appropriate pH value for the potential titration of arsenic with iodine ranges between (pH: 8-9). It also showed that the practical response of arsenic on the platinum electrode was fast when using Na₂SO₄ as a  electrolyte at a

concentration of  0.1M, which was successfully used for the quantitative determination of arsenic As³⁺ with a detection limit of up to 5×10^-7 mol/l.

The validity of this method, was studied on a environmental samples. It was also observed that there were high concentrations of arsenic in the sewage samples.Regarding soil samples, we noticed that the arsenic concentration was low in soils not irrigated with wastewater compared to soils irrigated with wastewater.