茜素和氟化物萃取分光光度法测定钛（IV）
Extraction and spectrophotometric determination of titanium(IV) with alizarin and fluoride.
作者信息
Nuñez R L, Mochon M C, Perez A G
机构信息
Department of Analytical Chemistry, Faculty of Chemistry, University of Sevilla, 41012 Sevilla, Spain.
出版信息
Talanta. 1986 Jul;33(7):587-91. doi: 10.1016/0039-9140(86)80135-7.
The characteristics of the mixed-ligand titanium(IV)-fluoride-alizarin complex, including the optimum conditions of formation and extraction into methyl isobutyl ketone, are described. A simple and sensitive procedure for spectrophotometric determination of titanium has been developed. At pH 9.5-10.3 titanium reacts with alizarin in the presence of fluoride to form a red-violet complex that is completely extractable into methyl isobutyl ketone, and has its absorption maximum at 513 nm. The molar absorptivity at 513 nm is 7.0 x 10(4)l.mole(-1).cm(-1). Beer's law is obeyed up to 22 mug of titanium in 30 ml of solution. The method has been used for the determination of titanium in an oxide mixture and aluminium alloy samples.
本文描述了混合配体钛（IV）-氟化物-茜素络合物的特性，包括其形成的最佳条件以及萃取到甲基异丁基酮中的情况。已开发出一种简单且灵敏的分光光度法测定钛的方法。在pH 9.5 - 10.3时，钛在氟化物存在下与茜素反应形成红紫色络合物，该络合物可完全萃取到甲基异丁基酮中，其最大吸收波长为513 nm。在513 nm处的摩尔吸光系数为7.0×10⁴ l·mol⁻¹·cm⁻¹。在30 ml溶液中，钛含量高达22 μg时符合比尔定律。该方法已用于测定氧化物混合物和铝合金样品中的钛。
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