Gravimetric analysis of calcium and strontium in calcium and strontium chloride system
JI Xiang1, HAN Hai-jun2, LI Dong-dong2, GUO Li-jiang2, ZENG De-wen*1
1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
Abstract：The accurate analysis method of calcium and strontium content in mixed system of calcium chloride and strontium chloride was investigated. Firstly, the single calcium chloride and strontium chloride solution was analyzed by carbonate gravimetric method, respectively. The relatively accurate determination results could be obtained. Moreover, the proper drying temperature and time for carbonate precipitate were also obtained, i.e., 200 ℃ and 20 h. On the basis of this, the mixed solution of calcium chloride and strontium chloride was accurately analyzed by combining carbonate gravimetric method with classical silver chloride gravimetric method. The total mass of carbonate precipitate and the amount of substance of total chloride were obtained. Then, the content of each component in the chlorides system of calcium and strontium was calculated by simultaneous system of equations. Finally, the proposed method was applied to analysis of calcium chloride and strontium chloride in chloride system when the ratio of the amount of substance between calcium and strontium was 49, 9.4, 0.98, 0.10 and 0.030, respectively. The results were relatively accurate, and the absolute error was less than 0.5%.
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