单宁酸-巯基乙酸分光光度法测定钛及其在钛处理钢及铁、非铁合金中的应用。

Spectrophotometric determination of titanium with tannin and thioglycollic acid and its application to titanium-treated steels and ferrous and non-ferrous alloys.

机构信息

Research & Control Laboratory, Durgapur Steel Plant, Durgapur-713203, West Bengal, India.

出版信息

Talanta. 1986 Apr;33(4):360-2. doi: 10.1016/0039-9140(86)80090-x.

Abstract

A sensitive spectrophotometric method for the determination of titanium by formation of its complex with tannin and thioglycollic acid at pH 4 has been developed. The intense yellow colour is measured at 400 nm and the system obeys Beer's law over the range 0.2-5 ppm titanium in the solution measured. The method is applicable to titanium-treated steels, stainless steels, permanent magnet alloys and duralumin alloys. The interference of Co, Ni, Cr, Mn, V, Mo and W can be eliminated by prior separation of titanium by controlled addition of cupferron in the presence of thioglycollic acid (TGA). Copper can be quantitatively separated by precipitation with TGA and determined complexometrically with EDTA, with PAN as indicator. Niobium interferes even in traces.

摘要

建立了在 pH 4 时用单宁和巯基乙酸与钛形成络合物，并用分光光度法测定钛的灵敏方法。在 400nm 波长下测量强烈的黄色，该体系在测定溶液中钛的浓度为 0.2-5ppm 范围内遵守比尔定律。该方法适用于经钛处理的钢、不锈钢、永磁合金和杜拉铝合金。在存在巯基乙酸的情况下，通过控制加入铜铁试剂，钛先被分离，钴、镍、铬、锰、钒、钼和钨的干扰可以消除。用 TGA 沉淀铜，然后用 EDTA 进行定量络合，用 PAN 作指示剂进行测定。即使存在痕量的铌也会产生干扰。