氨羧络合剂中微量EDTA的测定方法研究  

Study on method for determining trace EDTA in complexones

作　　者：秦永惠[1] 张进娥[1] 姜雅静 

机构地区：[1]河北大学化学系

出　　处：《化学试剂》1998年第5期287-288,310,共3页Chemical Reagents

摘　　要：提出一种新的测定氨羧络合剂中微量ＥＤＴＡ的催化光度滴定法。研究其滴定条件，并做了样品分析和对照实验。本法重现性好，精密度高，相对标准偏差为０．２％（ｎ＝５），线性范围为４×１０－５～１×１０－４ｍｏｌ／Ｌ。试用于氨三乙酸中微量ＥＤＴＡ的测定，结果满意。本法与ＥＤＴＡ－Ｃｒ（Ⅲ）分光光度法对照，结果基本符合。A new catalytic spectrophotometric titrimetric method for determining trace EDTA in the complexones is described. Titrimetric condition was studied. This method has high sensitivity, with a detection limit of 4×10 -5 mol/L, good reproducibility and high precision, the RSD is 0.2% ( n=5 ), linear range is 4×10 -5 ￣1×10 -4 mol/L. It has been used in the determination of trace EDTA in NTA with satisfactory results. The results obtained with this method agreed essentially with those by EDTA Cr(Ⅲ) spectrophotometric method.

关 键 词：催化光度滴定 氨羧配合剂 氨三乙酸 EDTA 分析 

分 类 号：TQ421.33[化学工程]