高纯三氧化钨中微量砷的测定,—般采用铜试剂银法和砷锑钼蓝法。前者虽然操作简单,但使用三氯甲烷有机溶剂对操作人员健康不利;后者灵敏度稍差,仅能达到0.005%。本法在前人工作的基础上采用结晶紫法测定高纯三氧化钨中微量砷,获满意结果,既消除了铜试剂银法存在的问题,又可使灵敏度达到0.001%。砷量在0—5微克/10毫升范围符合比尔定 Determination of trace amounts of arsenic in high purity tungsten trioxide - generally using the copper reagent silver method and arsenic antimony molybdenum blue method. Although the former is simple to operate, the use of chloroform as organic solvent is unfavorable to the operator’s health; the latter is slightly less sensitive and can only reach 0.005%. This method is based on the work of predecessors using crystal violet method for the determination of trace amounts of arsenic in high-purity tungsten trioxide. The satisfactory results are obtained, which not only eliminates the problem of copper reagent silver method, but also achieves the sensitivity of 0.001%. The arsenic content is in the range of 0-5 μg / 10 ml