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作为钽的光度定量法,在文献中介绍的有:连苯三酚(焦性没食子酸)法,栎精(3,5,7,3’,4’-五羟基黄酮)法,甲基紫法,孔雀绿法,二甲基荧光酮法以及苯基荧光酮法;另外还有丁基罗丹明 B 法,1-(2-吡啶偶氮)-间苯二酚法,次甲基蓝法,结晶紫法等。这些方法在钢铁、矿石、有色金属分析中已不同程度地被采用着.但是,这些方法中大部分要求把各种妨害元素预先分离或者采用其他补偿的办法。而且灵敏度也不算太高。文献提出了亮绿光度法作镍铁合金和金属铌中钽的定量法,钽和亮绿的络合物在有 F~-存在的情况下用苯萃取。钽在0～1.5ppm 的范围内服从比耳定律,对影响络合物萃取的各类因素、妨害元素等进行了研究,找到了测定钽的最适宜条件,并指明,采用本法
As the photometric method of tantalum, there are introduced in the literature pyrogallol (pyrogallol), quercetin (3,5,7,3 ’, 4’-pentahydroxyflavone) method, methyl violet Method, malachite green method, dimethylfluorone method, and phenylfluorone method; additionally, butyl rhodamine B method, 1- (2-pyridylazo) -resorcinol method, methionine blue method , Crystal violet method. These methods have been adopted to varying degrees in the analysis of steel, ore and non-ferrous metals, however, most of these methods require pre-separation of various preemptive elements or other methods of compensation. And the sensitivity is not too high. The literature proposes a bright-green method for the quantitative determination of tantalum in nickel-iron alloys and niobium metal. Tantalum and light-green complexes are extracted with benzene in the presence of F ~ -. Tantalum obeys Beer’s law in the range of 0-1.5 ppm, and studies various factors that affect the extraction of complex compounds, as well as the prejudicial elements. The most suitable conditions for the determination of tantalum have been found, and it is indicated that this method