摘要
在聚乙烯醇(PVA)存在下,Tl(SCN)_4^-与乙基紫形成离子缔合物。适宜酸度为0.12—0.36mol/L H_2SO_4,λ_(max)为560 nm,ε为1.12×10~6L·mol^(-1)·cm^(-1),Tl在0—10μg/25 ml范围服从比耳定律。考察了40多种共存物质影响,大多数元素不干扰。方法简单、快速,已用于某些岩矿中Tl的测定。
A highly sensitive spectrophotometric method has been developed for the determination of trace thallium on the basis of the formation of an ion-association complex with ethyl violet and thiocyanate in the presence of polyvinyl alcohol. In 0.12-0.36mol/L H2SO4, the molar absorptivity is 1.12 × 106 L·mol-1· cm-1 at 560 nm. Been's law is obeyed for thallium (Ⅲ) in the range of 0-10 μg/25ml. Tolerance limits for 42 foreign ions were tested. The method have proved to be satisfactory for the determination of thallium in some ores and minerals.
出处
《岩矿测试》
CAS
CSCD
北大核心
1991年第4期306-309,共4页
Rock and Mineral Analysis
关键词
铊
分光光度法
乙基紫
离子缔合物
thallium, spectophotometry, ethyl violet, thiocyanate, ion-association complex.
