DETERMINATION OF ALUMINUM IN WATER SOLUTIONS BY STRIPPING VOLTAMMETRY
Abstract
The possibility for determining the concentration of aluminum in aqueous solutions by stripping voltammetry has been demonstrated. The method is based on electrochemical cathodic aluminum accumulation on a vibrating mercury film electrode with subsequent registration of anodic current on the potentiodynamic voltammogram. Unlike conventional electrochemical methods of indirect determination of aluminum, based on the analysis of the adsorbed complexes of aluminum with dyes, the proposed approach allows to realize the direct determination of aluminum without binding it into coordination compounds. The method is based on the process of reversible reduction and oxidation of aluminum at pH 3,0-4,5 in aqueous dimethyl sulfoxide electrolyte containing calcium chloride, discovered by the authors, and has relative standard deviation of 1,8-2,4% in the aluminum concentration range from 10-4 to 10-5 g/dm3.
About the Authors
A. I. Kulak
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
N. P. Matveiko
Belarusian State Economic University
Belarus
Belarus
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