论文部分内容阅读
本文用2-(5-溴-2吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)进行了于水相中测定铌钽合量及铌的研究。以酒石酸为辅助络合剂,在0.65N硫酸溶液中,等量的铌和钽与适量的5-Br-PADAP生成有色络合物的吸光度是一致的,基于此原理拟定了测定矿石中铌钽合量的方法。在pH1.5～4的酒石酸溶液中,铌与5-Br-PADAP生成有色络合物的克分子吸光系数ε_(605nm)=5.5×10~4,是目前水相中测定铌比较灵敏的方法,应用差减法求得钽的分析结果也是可行的。本法操作简便快速、灵敏度高、方法稳定,该法可测定矿石中0.00x～1.0%的(Nb、Ta)_2O_5和0.00x～0.5%的Nb_2O_5。
In this paper, the determination of niobium and tantalum content and niobium in aqueous solution by 2- (5-bromo-2-pyridylazo) -5-diethylaminophenol (5-Br-PADAP) With tartaric acid as an auxiliary complexing agent, the absorbance of the colored complex formed by the same amount of niobium and tantalum with the appropriate amount of 5-Br-PADAP in 0.65N sulfuric acid solution is consistent. Based on this principle, the determination of niobium tantalum The amount of method. In the tartaric acid solution of pH 1.5 ~ 4, the molar absorptivity ε_ (605nm) of the colored complex formed between niobium and 5-Br-PADAP is 5.5 × 10 ~ 4, which is the most sensitive method for the determination of niobium in the aqueous phase , It is feasible to use the subtraction method to obtain the analysis result of tantalum. The method is simple, rapid, sensitive and stable. The method can determine (Nb, Ta) _2O_5 0.00x ~ 1.0% and Nb_2O_5 0.00x ~ 0.5% in ore.