摘要
在0.5—1.2mol·L^(-1)HCl中,新显色剂DBN-偶氮胂与钍形成紫色二元络合物.λ_(max)=630nm,ε_((?)30nm)=1.11×10~5L·mol^(-1)·cm^(-1),0—0.8μgTh/ml遵守比尔定律。在有酒石酸、草酸存在下,重稀土(Ⅲ)和大量铀(Ⅵ)不干扰。测定矿石中n·10^(-3)％级的钍,相对标准偏差为6.16％。
DBN-Arsenazo is a new chromogenic reagent which forms a binary purple complex with thorium instantaneously in 0.5—1.2 mol^(-1) HCl, λ_(max)=630nm, ε_(630nm)=1.11×10~5 Lmol^(-1). cm^(-1). Beer's law is obeyed for 0—0.8μg Th/ml. The complex is stable, not affected by the difference in temperature. The interference of heavy rare earth (Ⅲ) and large amount of uranium (Ⅳ) can be effectively eliminated by adding adequate oxalic acid and tartaric acid solution. This method gives high sensitivity and excellent selectivity. For determination of n.10_(-3)％ thorium in ore, relative standard deviation is 6.16％.
出处
《铀矿地质》
CSCD
北大核心
1991年第2期118-122,共5页
Uranium Geology
关键词
显色试剂
DBN-偶氮胂
钍
痕量
Chromogenic reagent, Trace thorium, Binary purple complex
