地下水中钙镁离子的自动连续测定

Continuous determine Ca2+ and Mg2+ of ground water by automatic titrate instrumont

研究了用GD-201通用自动滴定仪连续测定地下水样品中钙镁离子含量的方法。取一份溶液,以酸性兰K为指示剂,用EDTA进行滴定,由仪器判断滴定终点,计算机直接打出分析结果。方法操作简便,分析速度快,终点判断准确,实用性强。钙镁离子的相对标准偏差分别为1.23%、1.37%。检出浓度分别为0.126mg/L、0.143mg/L。回收率均在97.8%～104.1%之间。

The paper reseachs to determine Ca2+ and Mg2+ of ground water by automatic titrate instrumout It is titrated by EDTA The point of titration is judged by computer The method is simple and exact The detection limit for Ca2+ is 0126 mg/L The detection limit for Mg2+ is 0143mg/L The RSD of Ca2+ is 123% The RSD of Mg2+ is 137% The average recoverys of Ca2+ and Mg2+ are 978%~1041%