1. National Engineering Laboratory for Vacuum Metallurgy, Kunming 650093, China; 2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; 3. Key Laboratory of Non-ferrous Metal Vacuum Metallurgy of Yunnan Province, Kunming 650093, China
Abstract：A method for the determination of tin was established in high-lead chloride salt solution. The solution was produced in precessing the lead-tin materials by high temperature chloride salt method. A sensitive polarographic wave of Sn(IV) was found at -0.5 V during the determination of tin in oxalic acid-hydrochloric acid-methylene blue solution by differential pulse voltammetry polarography. The overlapping of peak position of Pb2+, Cd2+ with Sn4+ was solved. The results shown that the peak position of Sn4+ was separated from Pb2+ and Cd2+ and the gap was about 100 mV. For the determination of 0.25 mg/L Sn4+ in high-lead chloride salt solution, 1 000 times of Cl-, Na+, K+, F-, SO-4, NO-3; 200 times of Cu2+, Fe3+, Zn2+, Al3+, Mn2+; 100 times of Ca2+, Mg2+, Cr3+, Sb3+, Bi3+; 50 times of Ni2+, Co2+; 30 times of As3+, Pb2+ and Cd2+did not interfere in the determination at least. Under the optimum experimental conditions, the sample was determined with standard addition method, with the relative standard deviation of 2 % and the recovery of 98.8%-104.2%. The proposed method could be applied to determine tin in high-lead chloride salt solution.
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