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GB437—80《硫酸铜》中规定:测定硫酸铜含量时加焦磷酸钠1克,加碘化钾2～4克。但分析过程中在接近终点时出现回滴现象,长期以来一直没找到较好的解决方法。回滴现象不仅给分析带来麻烦而且影响着分析结果的精密度和准确性。为此进行了实验研究。1.实验部分焦磷酸钠与碘化钾的加入量对滴定反应的影响实验是在同一实验室,相同实验条件(仪器、试剂和溶液),接近终点时加入相同量淀粉指示剂,7人分15次进行的(实验
GB437-80 “copper sulfate” provisions: determination of copper sulfate content plus 1 g of sodium pyrophosphate, potassium iodide 2 to 4 grams. However, the phenomenon of drop-back occurred near the end of the analysis process. For a long time, no better solution has been found. Dropping phenomenon not only brings troubles to the analysis but also affects the precision and accuracy of the analysis results. To this end, an experimental study. 1. experimental part of the amount of sodium pyrophosphate and potassium iodide titration reaction experiments are in the same laboratory, the same experimental conditions (instruments, reagents and solutions), near the end of adding the same amount of starch indicator, seven were divided 15 times Carried out (experiment