直接测定钨产品中部分杂质元素的FAAS

Direct Determination of Impurity _ elements in Tungsten Products by FAAS

用氨水 -EDTA二铵盐作为钨产品的溶剂和干扰抑制剂 ,以空气 -乙炔火焰原子吸收法直接连续测定钨产品中Cd、Co、Cu、Fe、Mg、Mn和Ni元素。经三氧化钨标准样的验证 ,测定值与推荐值相符。实际样品的加标回收率为84.4%～106% ,RSD在1.18 %～5.18

A method for the direct determination of impurity _ elements Cd, Co, Cu, Fe, Mg, Mn and Ni in tungsten products by air-ethyne flame atomic absorption spectrometry has been developed, by using EDTA diammonium salt as solvent and matrix modifier to eliminate interference of matrix and concomitant elements. Standard samples were analyzed with satisfactory results. The recoveries of standard additions and relative standard deviations for practical samples of tungstic oxide and ammonium paratungstate are 84.8%～106% and 1.18%～5.18%, respectively.