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.
出处
《化学试剂》
CAS
CSCD
1998年第5期287-288,310,共3页
Chemical Reagents
