我区各矿山的大部分钨精矿中,铌钽氧化物含量在0.80％以上,个别矿山高达2.00％。而在钨精矿的化学分析方法中,往往忽略铌、钽对测定钨的影响。实际上,在辛可宁法中用辛可宁沉淀钨时,铌、钽亦会同时析出:在钨酸铵法中,铌、钽亦有部分进入钨酸铵溶液中而干扰钨的测定。 In most of the mines in our area, the content of niobium and tantalum oxide is above 0.80% and the individual mines are as high as 2.00%. However, in the chemical analysis of tungsten concentrates, the influence of niobium and tantalum on the determination of tungsten is often neglected. In fact, niobium and tantalum are simultaneously precipitated in the cinchinensis method by using cinchonine: in the ammonium tungstate method, some niobium and tantalum also enter the ammonium tungstate solution and interfere with the determination of tungsten.