摘要
在用电解法采集纯铜和普通黄铜样品时，根据样品的牌号确定样品的近似电化摩尔质量k，选择合适的电解条件使电流效率为100％，用Faraday定律m＝kIt计算采集样品的质量。文中讨论了确定k值的方法及误差、电解质的组成、电流强度的选择和阴离子交换膜的作用。
Based on the electrolytic dissolution principle and the characteristics of an anionexchange membrane which hinders cation passage, a novel procedure for dissolving pure copper and brass is described. The dissolver is a dual-cavity electrolytic cell with a membrane placed between the cavities. The dissoved amount of sample is calculated according to the Faraday law m=kIt. The proportion factor, i. e. electrochemical mole mass (k) of the law is defined according to the specifications of the sample. As compared with accurate value of k of the sample, the relative error of the defined k is <0. 042%. Suitable electrolysis conditions,e. g. electrolyte composition and current intensity, are selected to make the current efficiency be equal to 100%. For a 300 mA electrolytic current and 1 h of electrolysis, the calculated values of mass dissolved from pure copper, H96-07 and H62-2 brass are 0. 3558, 0. 3561and 0. 3597 g, respectively, in accordance with those of weight method. Copper and zinc in the anode liquor were titrated with EDTA after electrolysis. The results are in agreement with certified values of the above samples.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1996年第12期1409-1412,共4页
Chinese Journal of Analytical Chemistry
关键词
电解法
铜
黄铜
质量
Electrolysis, pure copper, brass
