用偶氮氯膦Ⅲ和偶氮胂Ⅲ吸光光度测定稀土时的行为和几种络合剂掩蔽效果的对比研究

• 作 者: 周执明 李晓林
• 出 处: 浙江工学院学报
• 发表日期: 1983年01期
• 关键词: 偶氮 稀土 偶氮氯膦Ⅲ EGTA 乙酯 络合物 氨羧络合剂 对比度 显色反应 吸光度

本文以铈为例,对比研究了用偶氮氯膦和偶氮胂吸光光度测定稀土时的行为。确定,前者的成络显色反应对比度大,生成的络合物稳定;后者的灵敏度较高,遵循比尔定律的范围较宽。并基于此,在两个显色体系中分别试验了EDTA二乙酯、CDTA、EGTA、EDTA、草酸和上述的各种氨羧络合剂和锌组成的缓冲掩蔽剂对21种元素的掩蔽效果。结果表明,在偶氮氟膦和偶氮胂体系中,分别以EDTA二乙酯、CDTA和EDTA二乙酯-锌的掩蔽性能最好。

In this paper, cerium, for example, comparative study of the chlorophosphonazo and arsenazo absorbance spectrophotometric determination of rare earth behavior. It is confirmed that the former has a large contrast ratio of the coloration reaction and a stable complex formed. The latter has a high sensitivity and follows a wide range of Beer’s law. Based on this, the masking effects of 21 kinds of buffer masking agents composed of EDTA diethyl ester, CDTA, EGTA, EDTA, oxalic acid and various ammonia carboxy complexing agents and zinc described above were tested in the two colorimetric systems respectively . The results showed that in the azofluorophosphine and arsenazo systems, the best masking properties of diethyl diethyl ether, CDTA and diethyl EDTA - zinc were the best.