硫氰酸钾光度法测定铅精矿中微量钼溶样方法的选择

Selection of solution method for the spectrophotometric determination of trace molybdenum in lead concentrate with potassium thiocyanate

采用Na2CO3-Na2O2熔融分解样品,溶样时间比Na2CO3-ZnO烧结法和王水-硫酸酸溶法短、溶样速度快。Pb2+生成碳酸铅沉淀,消除在测定微量钼时PdSO4的影响。拟定方法加标回收率在96.0%~102.0%之间,平均相对标准偏差(RSD)<5.0%。方法可用于实际测定铅钼矿中钼的含量,且该方法测定简便快速。

Using sodium carbonate-sodium peroxide to melt and decompose samples,the time of sample dissolution is shorter and faster than that of sodium carbonate-zinc oxide sintering and aqua regia-sulfuric acid dissolution method.Lead carbonate precipitation is formed by Pb2+to eliminate the influence of lead sulfate on the determination of trace molybdenum.The recovery of the proposed method is between 96.0%and 102.0%,the average relative standard deviation(RSD)is less than 5.0%.The method can be used to determine the molybdenum content in lead-molybdenum ore.The method is simple and rapid.