Abstract: According to the difference solubilities of strontium nitrate, barium nitrate，and calcium nitrate in organic solvents, carbonate samples were converted to nitrates, and then washing calcium nitrate with different organic solutions and titrating calcium content with EDTA.Different solvents and washing times that affect determination of calcium content in strontium carbonate were investigated and the recovery experiment was verified.A rapid and accurate method for analysis of calcium content in production of strontium carbonate was established，i.e. the nitrate was washed by anhydrous ethanol - anhydrous ether （volume ratio=1∶1） for 4 times.Standard sample recovery rates and RSD of this method were 98.4%~100.5% and 0.02%，respectively.

Key words: strontium carbonate, calcium carbonate, calcium nitrate, EDTA