碳酸钾熔融催化极谱法测定铌中钼、钨量

Determination of Molybdenum and Tungsten in Niobium by Potash Melting and Catalytic Polarography Method

将金属铌灼烧成氧化物后,用碳酸钾熔融样品,采用催化极谱法连续测定金属铌中微量钼、钨。考察了测量方式、温度、共存元素、样品前处理等因素对样品测定的影响。通过12份空白试验,计算出钼的检出限为1. 3μg /g,钨的检出限为1. 1μg /g;回收率分别为96%及102%。该方法准确可靠,可满足生产中分析测试要求。

After burning the metal niobium into oxide,the molten sample of potash was used,and the trace molybdenum and tungsten in the metal niobium were continuously determined by catalytic polarography. The effects of measurement method,temperature,coexisting elements and sample pretreatment were investigated. Through 12 blank tests,the detection limit of molybdenum was calculated to be 1. 3 μg /g,and the detection limit of tungsten was 1. 1 μg /g. The recovery rate of the determination results is 96% and 102% respectively. This method was accurate and reliable;it can satisfy the demand of industrial productive measuring.