摘要
钙离子选择性电极为指示电极，饱和甘汞电极作参比，用硼砂盐缓冲液控制ｐＨ，以ＥＧ－ＴＡ为滴定剂进行电位滴定。与现行用ＧＨＡ为指示剂、ＥＧＴＡ为滴定剂的络合滴定法相比，可减小络合滴定中目测终点的人为误差，故测量精度优于０．０８％。
By using calcium ion selective electrode (Ca ISE) as indicating electrode, saturated calomel electrode (SCE) as reference electrode and EGTA as titrant calcium in seawater was determined by potentiometric titration in borate buffer solution. This method can reduce observation errors in the determination of the end point, and thus provides a better analytical precision(<0.08%)than normal complexometric titration.
基金
国家自然科学基金
关键词
钙离子选择电极
钙
海水
电位滴定
calcium ion selective electrode
calcium
seawater
potentiometric titration
