示波极谱法直接测定锌电解液中钴的研究  

Direct Determination of Trace Cobalt in Zinc Electrolyte Solution by Oscillopolarography

作　　者：曹道锦[1] 张明浩[2] 

机构地区：[1]长沙大学化学系,湖南长沙410003 [2]中南工业大学化学化工学院,湖南长沙410083

出　　处：《分析测试学报》2000年第3期23-26,共4页Journal of Instrumental Analysis

摘　　要：研究了pH5 0的HAc -NaAc介质中 ,存在大量锌时 ,钴 -丁二酮肟 -柠檬酸钠 -氯化铵体系灵敏的配合物吸附波。峰电位 -0 .93V ,在0 0001～0 .1mg/L范围内钴质量浓度与峰电流呈线性关系 ,检出限达8 5×10-10mol/L。方法无须预处理可直接测定电解锌料液中微量钴。对电活性配合物的组成。A method for the direct determination of a trace of cobalt(Ⅱ)in zinc electrolyte solution by oscillopolarography is presented, keeping the zinc interference in a constant value with a large amount of zinc. The sensitive adsorptive wave of cobalt(Ⅱ)-dimethyl glyoxime-NH4Cl-sodium citrate system in the medium of HAc-NaAc with pH 5.0 in the presence of a large amount of zinc was studied. The peak potential is at -0.93 V. The linear range of 0.000 1～0.1 mg/L and detection limit of 8.5×10-10mol/L for cobalt(Ⅱ) were found. The method has been utilized to determine the trace of cobalt(Ⅱ) in real samples without pretreatment. The results are quite well with those obtained by ICP-AES. The components of the electro _ active complex, properties of the polarographic wave and the mechanism of the electrode process have been also studied.

关 键 词：示波极谱法 钴 锌 电解液 湿法冶炼 

分 类 号：TF813.013[冶金工程—有色金属冶金] O614.812[理学—无机化学]