摘要
研究了铈 ( ) - DBC-偶氮氯膦 -磷酸 - EDTA新体系光度法测定贵金属合金中的微量铈。反应体系生成蓝色配合物的λmax=650 nm,灵敏度高 ,摩尔吸光系数ε=0 .91× 1 0 5L· mol- 1· cm- 1,在铈 0～ 50μg/2 5m L范围内符合比尔定律 ,方法选择性强、适应性广 ,用于分析银合金和铂合金中铈 ,S≤ 0 .0 1 5,RSD≤ 1 .9%。
In order to determine micro cerium in the precious metal alloys,a new color reaction of Ce(Ⅲ) with DBC chlorophosphonazo,phosphonic acid and EDTA has been studied.A stable blue complex (λ max =650nm,ε=0.91×10 5L·mol -1 ·cm -1 ) is formed in the reaction system.Beer′s law is obyed in the range of 0 50g/25mL for Ce(Ⅲ).This method has been succesfully applied to the determination of Pr in silver alloys,S≤0.015,RSD≤1.9%.It has good selectivity and suitabitity.
出处
《稀土》
EI
CAS
CSCD
北大核心
2000年第2期34-36,共3页
Chinese Rare Earths
基金
昆明贵金属研究所研究与发展基金
