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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。
Differential Pulse Anodic Voltammetry for On - line Detection of Copper (II) Concentration in Biological Metallurgy. The results show that there is a good linearity between the anodic oxidation peak current and the concentration measured by differential pulse anodic voltammetry in the presence of only copper (II) and its concentration in the range of 1 μmol / L to 1 mmol / L. When 0.2 mol / L KCl was contained in this system, the linear range of copper ion detection was extended from 1 mmol / L (64 mg / L) to 100 mmol / L (6.4 g / L). Under these conditions, the reduction of divalent copper ions is divided into two-step continuous one-electron transfer process, and the intermediate state is CuCl-. In addition, ferric ions are often present in the copper bio-metallurgical system. Therefore, the interference of iron ions detected by copper ions has also been studied. The results show that when the ferric ion concentration is less than 100 mmol / L (5.6 g / L) , Its interference with copper ion detection is negligible.