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自硫酸-硝酸-酒石酸-草酸溶液中用亚硒酸可定量沉淀钽。沉淀用合亚硒酸的硝酸再用乙醇洗滌后,可溶解在盐酸-草酸溶液中。溶液中的亚硒酸可用硫代硫酸鈉滴定。在110°烘干后,沉淀的組成很接近于Ta_2O_5·SeO_2·2H_2O。这一沉淀可作钽的容量测定法及重量法称衡形式的基础。
Tantalum can be quantitatively precipitated with selenite from sulfuric acid-nitric acid-tartaric acid-oxalic acid solution. Precipitated with selenious nitric acid and then washed with ethanol, can be dissolved in hydrochloric acid - oxalic acid solution. Selenite in solution can be titrated with sodium thiosulfate. After drying at 110 ° C, the composition of the precipitate is very close to that of Ta_2O_5 · SeO_2 · 2H_2O. This deposit can be used as a tantalum volumetric method and gravimetric method for weighing forms.