Analytical Sciences

Determination of Chromium(VI) in Electronics Materials Using Trioctylamine Modified Carbon Paste Electrode

Juan XU,*,** Yong KONG,* Wenchang WANG,* Zhidong CHEN,* and Shiping YAO***

*Jiangsu Polytechnic University, Qualtec Co. Ltd., Changzhou 213164, P. R. China
**Jiangsu Fine Petroleum Chemical Key Laboratories, Changzhou 213164, P. R. China
***ChemChina Petroleum Development Corporation, Beijing 100080, P. R. China

A trioctylamine (TOA) modified carbon paste electrode (TOA/CPE) was firstly utilized to determine Cr(VI) in electronics materials. The effects of preconcentration conditions, that is, TOA amount and accumulation time on Cr(VI) accumulation were examined and the optimum experiment conditions for the determination were identified. A sensitive reduction peak in the stripping voltammogram at −0.45 V, a characteristic of trace Cr(VI), was detected when the accumulation time was 10 min. Under optimized conditions, TOA/CPE demonstrated an enhanced sensitivity for Cr(VI), providing a low detection limit (S/N = 3) at 3.4 × 10⁻⁹ M. Interference studies also displayed high selectivity of the TOA/CPE for Cr(VI); this electrode can accurately determine Cr(VI) in the presence of Cr(III) (600-fold concentration) and other interfering cations.

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