On-line detection of Cu(II) in bioleaching system by anodic stripping differential pulse voltammetry  

差分脉冲伏安法对生物冶金中铜(II)的在线检测(英文)

作　　者：金妍[1,2,3] 陈淼 金庆辉[1] 赵建龙[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所传感技术联合国家实验室,上海200050 [2]CSIRO Process Science and Engineering,Box312,Clayton South,Victoria 3169,Australia [3]中国科学院大学,北京100049

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第2期582-587,共6页中国有色金属学报（英文版）

基　　金：Projects(2012CB933303,2011CB707505)supported by the National Basic Research Program of China;Project(2012BAK08B05)supported by the National Key Technology R&D Program of China;Projects(11391901900,11530700800,10391901600,201101042,11CH-15)supported by Science and Technology Commission of Shanghai Municipality,China;Project supported by Funding from CSIRO CEO Science Leader Program

摘　　要：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 1μmol/L （64μg/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）.采用差分脉冲阳极伏安法实现生物冶金中铜(II)浓度的在线检测。结果表明,当体系中仅有铜(II)存在且其浓度范围为1μmol/L～1 mmol/L时,差分脉冲阳极伏安法所测阳极氧化峰电流与浓度间有很好的线性度。当此体系中含有0.2 mol/L KCl时,铜离子检测的线性范围从1 mmol/L(64 mg/L)扩展到100 mmol/L(6.4 g/L)。在此条件下,二价铜离子的还原分为两步连续的单电子转移过程,中间态为Cu+的络合物CuCl-。此外,在铜的生物冶金体系中,经常会有铁离子存在,因此对铜离子检测的铁离子干扰也进行了研究,结果表明,当铁离子浓度低于100 mmol/L(5.6 g/L)时,其对铜离子检测的干扰可忽略。

关 键 词：peak current Fe3＋interference 

分 类 号：TG115.3[金属学及工艺—物理冶金] TF18[金属学及工艺—金属学]