Indirect determination of sulfide ions in water samples at trace level by anodic stripping voltammetry using mercury film electrode?

Analytical Methods Pub Date: 2009-12-07 DOI: 10.1039/B9AY00183B

Abstract

A simple and sensitive indirect determination method for sulfide in water samples by anodic stripping voltammetry (ASV) using mercury-film electrode (MFE) has been developed, which is based on the determination of residual cadmium ion after reaction of Cd2+ with S2?. The linear range is adjustable depending on Cd2+ concentration, for example, the determination of S2? can be achieved in the range of 1.5–7.0 × 10?6 mol L?1 by selecting 3.0 × 10?6 mol L?1 Cd2+. The detection limit is 1.3 × 10?8 mol L?1 under optimum conditions, and the relative standard deviation (RSD, n = 10) for 2.0 × 10?6 mol L?1 S2? is 0.7%. Compared with other methods, this method has the following prominent advantages: with low detection limit, easy to operate and less interference. The proposed method has been successfully applied to the determination of S2? in synthetic wastewater, lake water, beverage, spring water and real wastewater samples.

Graphical abstract: Indirect determination of sulfide ions in water samples at trace level by anodic stripping voltammetry using mercury film electrode
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