论文部分内容阅读
铜为镀铬液中有害杂质之一,必须定期进行控制检验,常用的测定方法有电解法、碘量法或硫化铜沉淀重量法等。上述方法虽然都能获得准确的结果,但均有手续烦、费时长的缺点,不能满足及时控制生产的要求。目前铜的比色测定法已普遍应用于各种物质中低含量铜的测定。赵景周提出用有机溶剂置换萃取——比色法测定铜,其原理是根据铜试剂(DDTC)在pH 8.5～11时,与金属离子生成络合物的稳定顺序:
Copper is one of the harmful impurities in chrome plating liquid, it is necessary to carry out regular control tests. The commonly used methods for determination are electrolytic method, iodometric method or copper sulfide precipitation weight method. Although the above methods can obtain accurate results, they all have the disadvantages of troublesome procedure and long time consuming and can not meet the requirements of timely control of production. At present, the colorimetric determination of copper has been widely used in the determination of low levels of copper in various substances. Zhao Jingzhou proposed organic solvent replacement extraction - colorimetric determination of copper, the principle is based on the copper reagent (DDTC) at pH 8.5 ~ 11, with the metal ions to generate the stable order of the complex: