分光光度法测定铊，测定前先将其作为氯络合物与派洛宁G的离子对进行萃取。

Spectrophotometric determination of thallium after its extraction as an ion-pair of the chloro-complex and pyronine G.

作者信息

Namboothiri K K, Balasubramanian N, Ramakrishna T V

机构信息

Department of Chemistry, Indian Institute of Technology, Madras 600 036, India.

出版信息

Talanta. 1991 Aug;38(8):945-9. doi: 10.1016/0039-9140(91)80277-7.

DOI:10.1016/0039-9140(91)80277-7

PMID:18965242

Abstract

A sensitive and selective procedure for the spectrophotometric determination of thallium is described. The method is based on the formation of an ion-pair between TlCl(4) and the pyronine G cation in chloride-containing acid media. The ion-pair is extracted into benzene and permits the determination of as low as 0.3 mug of thallium in a final volume of 25 ml at 530 nm. The system obeys Beer's law in the concentration range 1-14 mug of thallium in a final volume of 25 ml. Potassium iodate was found to be highly effective for the oxidation of Tl(I) to Tl(III) and the presence of excess oxidant does not interfere. The method can be used for the determination of thallium in high purity cadmium, cadmium sponge and rock samples.

摘要

描述了一种用于分光光度法测定铊的灵敏且选择性好的方法。该方法基于在含氯酸性介质中，[TlCl₄]⁻与吡啰红G阳离子形成离子对。该离子对被萃取到苯中，在530nm波长下，最终体积为25ml时可测定低至0.3μg的铊。在最终体积为25ml、铊浓度范围为1 - 14μg时，该体系符合比尔定律。发现碘酸钾对将Tl(I)氧化为Tl(III)非常有效，且过量氧化剂的存在不产生干扰。该方法可用于测定高纯镉、海绵镉和岩石样品中的铊。