银-二乙基二硫代氨基甲酸钠法测定铁矿石中砷溶样方式的改进

Improvement of Sample Dissolution Method for the Determination of Arsenic in Iron Ores by Ag-DDTC Method

改进了铁矿石样品溶解方法,尝试用硫-磷混酸溶解铁矿石样品,缩短了分析时间,提高了分析精度。溶解后的样品以银-二乙基二硫代氨基甲酸钠法(Ag-DDTC)用于部级标准物质测定,砷的测定结果与标准值相符;用于碱性矿石如球团样品中砷的分析,多名操作者的测定结果吻合。

The sample dissolution method is improved through using mixed acid of sulfuric acid-phosphoric acid to dissolve iron ore samples. Arsenic in sample solution from the new sample dissolution method is then determined by Ag-DDTC method. The new method provides the advantages of high precision, high efficiency and has been applied to the determination of arsenic in the Stand- ard Reference Materials. The results are in agreement with certified values and those by other analytical methods.