利用自制梯度混合室 ,建立了离子选择电极流动注射电位滴定测硬度的新方法。确定载流为 10 - 4mol·L- 1EDTA溶液 (滴定剂 ) ,流速 8.0ml·min- 1,进样体积 12 0 μl ,分析速度 60样·h- 1,通过调节滴定剂浓度 ( 10 - 5 ～ 10 - 3 mol·L- 1) ,可检测 10 - 5 ～ 10 - 1mol·L- 1Ca2 +、Mg2 +。方法用于天然水和饮料分析 ,结果令人满意 A new method of flow injection potentiometric titration of ion selective electrode was established by using a homemade gradient mixing chamber. The flow rate was determined to be 10 - 4mol·L-1 EDTA (titrant), the flow rate was 8.0ml · min-1, the injection volume was 12μl, the analysis speed was 60 h · h- ~ 10 - 3 mol·L - 1), which can detect 10 - 5 ~ 10 - 1 mol·L-1Ca2 + and Mg2 +. The method was used for natural water and beverage analysis with satisfactory results