中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 24 No. 2 February 2014 |
（1. State Key Laboratory of Transducers Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
2. CSIRO Process Science and Engineering, Box 312, Clayton South, Victoria 3169, Australia;
3. University of Chinese Academy of Sciences, Beijing 100049, China）
Abstract:On-line Cu (II) ion concentration detection in bioleaching system was achieved by anodic stripping differential pulse voltammetry (ASDPV). Good linearity between Cu (II) concentration and oxidation peak current was obtained when Cu (II) existed in 0K media in the concentration range of 1 μmol/L (64 μg/L) to 1 mmol/L (64 mg/L). Moreover, when 0.2 mol/L KCl was added into this media, the linear detection range could be extended from 1 mmol/L to 100 mmol/L (6.4 g/L). The reduction of Cu (II) to metallic copper was shown to proceed as two successive single-electron transfer reactions involving an intermediate chemical step where the cuprous ion (Cu+) was complexed by chloride to form the dichlorocuprous anion (CuCl-). In addition, interference effect was also investigated when Fe3+ existed in the media, which was the common situation in the copper bioleaching system. The results showed no interference effect once the concentration of Fe3+ was less than 100 mmol/L (5.6 g/L).
Key words: anodic stripping differential pulse voltammetry (ASDPV); peak current; Cu (II); Fe3+ interference
