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钽的比色方法有邻苯三酚法,偶氮砷法。邻苯三酚法操作緩慢,不易掌握。偶氮砷法,虽有一定量的钛,锆,鋁,铁等元素允許存在而无干扰,但铌可与钽同时发色。应用于銅铁分析时,都不是理想的方法。最近有介紹用結晶紫-苯抽取钽的方法,在适当的酒石酸-氫氟酸溶液中,鈕酸与氢氟酸形成带負电荷的阴离子TaF_6此阴离子能与結晶紫生成兰紫色的固态絡合物而被苯萃取出来,进行比色絡合物顏色深度与溶液中钽的含量成正比,从1～20微光之間符合
Tantalum colorimetric method pyrogallol method, azo arsenic method. Pyrogallol method operation is slow, not easy to grasp. Arsenic arsenic method, although a certain amount of titanium, zirconium, aluminum, iron and other elements allowed to exist without interference, but niobium and tantalum at the same time hair color. When applied to the analysis of copper and iron, are not the ideal method. Recently, the method of extracting tantalum with crystal violet-benzene was introduced. In an appropriate tartaric acid-hydrofluoric acid solution, the acid and hydrofluoric acid form a negatively charged anion TaF_6. This anion can form a purple-blue solid state complex with crystal violet And was extracted by benzene, colorimetric complex color depth and the solution is proportional to the content of tantalum, from 1 to 20 between the glimmer of light