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α-羥基羧酸与一系列金属离子所形成的絡合物,长期以来被用来分离和測定某些元素。其中特别是一些能形成可溶性絡合物的α-羥基羧酸,如酒石酸、檸檬酸、三羥基戊二酸、苹果酸、羥基乙酸以及乳酸等,业已广泛地应用于各种化学分析和物理化学分析法中。但是,相应地,金属离子与α-羥基羧酸的沉淀作用和萃取过程却研究甚少。本文就这类有机試剂在分析化学中的应用作一簡单总結。属于沉淀剂类型的α-羥基羧酸的典型化合物乃是杏仁酸(又称苦杏仁酸、苯乙醇酸、苯羟乙酸等)。近
Complexes of α-hydroxycarboxylic acids with a series of metal ions have long been used to separate and determine certain elements. Among them, some α-hydroxycarboxylic acids which form soluble complexes, such as tartaric acid, citric acid, trihydroxy glutaric acid, malic acid, glycolic acid and lactic acid, have been widely used in various chemical analysis and physicochemical Analytical method. However, little attention has been given to the precipitation and extraction of metal ions and α-hydroxycarboxylic acids. This article briefly summarizes the application of these organic reagents in analytical chemistry. Typical compounds of alpha-hydroxycarboxylic acids of the precipitant type are mandelic acid (also known as mandelic acid, mandelic acid, benzilic acid and the like). near