两种不同标定EDTA的方法比较及误差分析

摘要

用金属锌粒和ZnSO4·7H2O两种基准物质标定ED-TA，并用已知浓度的EDTA滴定已知准确浓度的钙离子标准溶液，探索出实验室标定EDTA最合适的方法。%We used zinc and ZnSO4·7H2O as two kinds of stan-dard substances to titrate EDTA solution and then used standard EDTA solution to titrate calcium ion standard solution. By com-paring the concentration of calcium ion, we found the most opti-mized methods to calibrate EDTA.