示波极谱法测定铁矿石中微量砷

Oscillopolarographic Determination of Trace Arsenic in Iron Ores

报道了H2 SO4-Te(Ⅳ ) -NH4I体系极谱法测定铁矿石中的微量砷。试验表明 ,采用HNO3 、HCl混合酸分解试样 ,溶液中大量铁不需分离 ,在测定体系中Fe3 + 允许存在量为 6mg。方法经部级标样分析验证 ,结果与推荐值相符 ,6次测定的相对标准偏差小于 1 4%。

An oscillopolarographic method with H 2SO 4-Te(Ⅳ)-NH 4I system for the determination of trace arsenic in iron ores was reported in this paper. The mixture acid of HCl+HNO 3 was used for sample decomposition. The experiments showed that no interference from Fe 3+ with up to 6 mg in the system was observed. The method has been applied to the determination of trace arsenic in standard samples. The results are in agreement with certified values with precision of <14% RSD ( n =6)