不同水样中微量的EDTA的测定

Determination of Trace EDTA in Different Water Samples

在一定条件下加入解蔽剂,使被测水样中EDTA和重金属离子产生的络合物分离开来,得到游离态的EDTA,然后采用有机萃取法,将从络合物中释放出的重金属离子通过萃取进入有机相中,从而达到分离EDTA的目的,最后用滴定法测定水样中所含的EDTA。本测定方法相对于其他测定方法具有思路清晰、操作简单、排出干扰离子、试剂用量少等显著优点。

Experiments under certain conditions to join demasking agent,so that the tested water samples in EDTA and heavy metal ions complexes separated to give the free state of EDTA,and then using the organic extraction,from the complex heavy metal ions released by the extraction into the organic phase,so as to achieve the purpose of separation of ethylene diamine tetra-acetic acid,and finally water samples contained EDTA titration method. The measurement method compared to other measurement method has clear ideas,simple operation,discharge significant advantages interfering ions,reagent consumption and so on.