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前言水质中氯离子的分析通常采用操作较繁的比色法及容量分析法。在电位法中,氯离子选择电极直接法测定氯离子,操作是简便快速的,测定灵敏度可达10~(-4)NCl~-,但准确度较差;采用准确度较高的电位滴定法,氯离子选择电极、Ag-AgCl丝电极、银电极、铂电极均可作为指示电极,但其滴定终点不突跃,通常需逐一记下滴定的毫升数及对应的毫伏数再作图后方能找出滴定终点。Prokopov采用丙酮非水介质进行电位滴定,以铂电极作指示电极,饱和甘汞电极(硝酸钾盐桥)作外参考电极,曾得到滴定的突跃终点。
Preface Chlorine ion analysis of water quality is usually the use of more complex colorimetric and capacity analysis. In the potentiometric method, the chloride ion selective electrode is used for the direct determination of chloride ions, the operation is simple and rapid, and the determination sensitivity is up to 10 ~ (-4) NCl ~ -, but the accuracy is poor; the high accuracy potentiometric titration , Chloride ion selective electrode, Ag-AgCl filament electrode, silver electrode, platinum electrode can be used as the indicator electrode, but the titration end point does not jump, usually one by one titrate the titration milliliters and the corresponding millivolt number and then plot the rear Can find the titration end point. Prokopov potentiometric titration with acetone non-aqueous medium, with platinum electrode as the indicator electrode, saturated calomel electrode (potassium nitrate salt bridge) as an external reference electrode, have been titration end of the jump.