Article

Inorganic Materials

, Volume 48, Issue 14, pp 1279-1284

First online:

Determination of chromium (VI) using cathodic voltammetry technique in gold microelectrodes

  • E. A. ZakharovaAffiliated withTomsk Polytechnical University Email author 
  • , E. E. ElesovaAffiliated withTomsk Polytechnical University
  • , A. A. SkorokhodovaAffiliated withTomsk Polytechnical University
  • , G. N. NoskovaAffiliated withTomsk Polytechnical University

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Abstract

Electrochemical reduction of chromium (VI) is studied on a gold microelectrode assembly (Au-MEA) using the cathodic voltammetry (VA) technique. The optimum conditions for obtaining the analytical signal of Cr (VI) are chosen. The range of the analyzed concentrations of Cr (VI) are 0.005–0.2 mg/L, and the detection limit is 5 × 10−5 mg/L. Dissolved oxygen, manifold excesses of alkali and alkaline-earth ions, 200-fold excesses of Cr (III), and 10-fold excesses of Fe (III) and Cu (II) do not interfere with determination of 0.005 mg/L Cr (VI). In the presence of anionic surfactants (DDCNa), the signal of Cr (VI) decreases, but the linear dependence on the concentration remains. A rapid technique for determination of Cr (VI) in purified technical water without sample preparation is suggested. The advantage of Au-MEA consists in the simplicity of synthesis, running time, high sensitivity.

Keywords

chromium cathodic voltammetry gold electrode microelectrode assembly