极谱法快速测定湿法炼锌新液中的微量钴

摘要

在pH5.6 HAc-NaAc介质中，Co（Ⅱ）-DMG-NH４Cl-柠檬酸钠-乳化剂体系产生灵敏的络合物吸附波，其峰电位为-0.93V（vs SCE），线性范围为0.0016～0.1μg／mL，检出限为4×10-10 mol／L。此方法直接用于湿法炼锌新液中微量钴的快速测定（5 min），所得结果令人满意，目前已在生产实际中得以应用。%According to investigation, in the system of ammonium chloride-acetic acid-sodium acetatesodium citrate-emulgent, Co(Ⅱ)-dimethylglyoxime complex produces a sensitive complex adsorption wave at the potential of -0.93 V. The peak current is directly proportional to the concentration of Co(Ⅱ) in the range of 0.0016 to 0.1 μg*mL-1. The detection limit is 4×10-10 mol/L. This system can be used in rapid determination of trace Co(Ⅱ) in fresh zinc electrolyte.