水中Cl-的测定方法及测定精度的因素分析

Determination methods of chloride ion concentration in water and factor analysis of determination precision

水中Cl^-浓度的测定方法有很多,硝酸银滴定法是测定Cl^-的仲裁方法。在硝酸银滴定法中影响测定Cl^-的因素很多,主要包括水样pH的影响、氯化银白色沉淀造成的视觉因素的影响、铬酸钾指示剂的浓度影响及杂质离子,如S^(2-)、SO_3^(2-)和S_2O_3^(2-)的干扰等,如何消除这些影响是研究的终点。

There are many methods for determining chloride ion concentration in water.Among them,silver nitrate titration is the arbitration method for determining chloride ion.There are many factors affecting the determination of chloride ion in silver nitrate titration,which are pH of water sample,visual factors caused by AgCl white precipitation,concentration of potassium chromate indicator,interference of impurity ions such as S^2-,SO3^2-and S2O3^2-,etc.How to eliminate these effects is the end point of the study.