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在含有8％酒石酸铵及pH4.8—5.2的溶液中沉淀8-羟基喹啉铌,可使铌与钽、钛等定量分离,但组成没有确定。我们采用这一条件沉淀8-羟基喹啉铌,并用灼烧沉淀、溴酸钾-碘法、碳-氢元素分析及库仑法证明,这样获得的沉淀具恒定的组成,其化学式为NbO(C_9H_6ON)_3。根据Patriarch用电生的溴溴化8-羟基喹啉以间接测定药物中的Co,Костромин用类似方法间接测定了Al。我们应用NbO(C_9H6_ON)_3的恒定组成,找出了用库仑滴定法测定铌的条件。 (一)仪器和主要试剂库仑滴定线路及电解池同硒的库仑滴定:采
The precipitation of niobium 8-hydroxyquinoline in a solution containing 8% ammonium tartrate and pH 4.8-5.2 allowed the quantitative separation of niobium from tantalum, titanium, etc., but the composition was not established. We used this condition to precipitate niobium 8-hydroxyquinoline and proved to have a constant composition with a burning precipitate, potassium bromate-iodine method, carbon-hydrogen elemental analysis and coulometry, and the resulting precipitate has a constant composition of NbO (C_9H_6ON) _3 . According to Patriarch for indirect determination of Co in brominated brominated bromine 8-hydroxyquinoline, Костромин indirectly determined Al in a similar manner. We use the constant composition of NbO (C_9H6_ON) _3 and find the conditions for the determination of niobium by Coulometric titration. (A) of the instrument and the main reagent Coulometric titration circuit and the same coulometric titration of selenium: mining