Dong Y.-N.,Mineral Resources Supervision and Inspection Center |
Xiong Y.,Mineral Resources Supervision and Inspection Center |
Han Z.-X.,Mineral Resources Supervision and Inspection Center |
Pei R.-H.,Mineral Resources Supervision and Inspection Center |
Zhang Q.,Mineral Resources Supervision and Inspection Center
Yejin Fenxi/Metallurgical Analysis | Year: 2015
The copper ore and lead-zinc ore samples were dissolved with hydrochloric acid and nitric acid. Tin was co-precipitated with ferric hydroxide for the separation from copper, lead and zinc. The tin-containing precipitation was fused with sodium oxide followed by extraction with hot water. In sulfur acid medium, the thiourea-ascorbic acid-tartaric acid was added to mask the interference elements in solution. Then, the content of tin was determined by hydride generation-atomic fluorescence spectrometry (HG-AFS). The separation conditions for tin from copper, lead and zinc were obtained: the pH of sample solution was adjusted to 4.5 with ammonia water; the addition amount of ferric ion was 20 mg. The determination range of proposed method was 0.001%-1% with detection limit of 3 μg/g. The interference test of coexisting ions in sample was conducted. The results indicated that most main elements (copper, lead and zinc) were separated from tin after co-precipitation treatment without interference to the determination of tin. The interference of arsenic and antimony could be eliminated by dilution or reducing the sampling amount. The determination of tin was not affected by other elements. The proposed method was applied to the determination of actual samples. The recovery test was also performed. The recoveries were between 95% and 102%. The copper ore and lead-zinc ore samples were also determined by eight different laboratories. The results showed that the method exhibited good precision. ©, 2015, Central Iron and Steel Research Institute. All right reserved.