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Tintaru Viorica等曾应用乙基紫作显色剂,在氢氟酸和草酸铵介质中与氟钽酸络阴离子形成离子缔合物,然而他们选用了对人体有害的有机溶剂苯作萃取剂,而且仅做了方法研究,没有应用到实际样品分析。本文研究在氟化钠和硫酸介质中,氟钽酸络阴离子与乙基紫形成的离子缔合物,易为乙酸丁酯所萃取,可用来比色测定微量钽。本文研究了萃取比色的基本条件,详细探讨了共存离子的干扰情况,确定了络合物的组成,并应用于钢铁中微量
Tintaru Viorica et al. Used ethyl violet as a color former to form ion-association with hydrofluoro-tantalum acid anions in hydrofluoric acid and ammonium oxalate media. However, they chose benzene, an organic solvent harmful to human body, as an extractant, and Only methodological studies have been done and are not applied to actual sample analysis. In this paper, sodium fluoride and sulfuric acid in the medium, fluoride tantalum acid anion and ethyl violet form ion-association, easily extracted by butyl acetate, can be used for colorimetric determination of trace tantalum. In this paper, the basic conditions of colorimetric extraction were studied, the interference of coexisting ions was discussed in detail, the composition of the complex was determined,