摘要
以王水溶解试样,用氨水作沉淀剂,并加入适量三乙醇胺及柠檬酸进行掩蔽,以消除铁及铬等元素的干扰。在pH=3～6的酸性介质中,加入过量的EDTA标准溶液,使镍与EDTA形成稳定的络合物。以PAN为指示剂用硫酸铜标准溶液滴定过量的EDTA标准溶液,从而求得镍的含量。
Sample was solved in aqua regia with ammonia water as precipitant, adding suitable triethanolamine and citric acid for covering to eliminate the interference of element iron, chrome, etc. In the acid medium with pH = 3 - 6, adding excessive EDTA standard solution made nickel and EDTA forming stable complex. The excessive EDTA standard solution was titrated using copper sul-fate with PAN as indicator so as to obtain nickel content.
出处
《化学分析计量》
CAS
2002年第1期32-33,共2页
Chemical Analysis And Meterage
