本文,应用前人的实验条件来测定硅酸盐及碳酸盐中的钙。实验表明,以钙选择电极为指示电极,212型甘汞电极为参比电极,用EGTA电位滴定,浦定酸度在pH≥11时,结果令人满意,且较文献介绍的方法简单而可靠。在测定CaO含量分别为0.86—13.63%的硅酸盐和28.04%的碳酸盐试样时,标准偏差为±0.017—0.26%,回收率为97—101%。 In this paper, we apply the previous experimental conditions to determine the calcium in silicate and carbonate. Experiments show that the calcium selective electrode as the indicator electrode, 212 calomel electrode as the reference electrode with EGTA potentiometric titration, Puding acidity at pH ≥ 11, the results are satisfactory, and the method described in the literature is simple and reliable. In the determination of CaO content of 0.86-13.63% of the silicate and 28.04% of the carbonate sample, the standard deviation of ± 0.017-0.26%, the recovery rate of 97-101%.