包头铁矿石中痕量铀的测定

Determination of Trace Uranium in Iron Ore of Baotou

摘要: 采用碳酸钠沉淀、P350萃淋树脂微色谱柱联合分离的方法，测定铁矿石中痕量铀的含量。首先用碳酸钠将样品溶液沉淀除去大量的铁，再用P350微色谱柱分离富集痕量铀，以4 g/L氟化钠溶液洗脱，偶氮氯膦Ⅲ光度法测定铁矿石中痕量铀的含量。通过研究铁和铀分离的条件，在最佳分离条件下，铁的分离效率达99.9%，能有效地消除样品中大量铁的干扰并富集痕量铀。经包头铁矿样品验证，分析结果接近标准样品参考值，通过标准加入法获得的回收率为98.6%~101.4%。

Abstract: By using a carbonate precipitation-P350 levextrel resin column chromatography combination method, more than 99.9% of iron was removed from the specimens, and the trace uranium was concentrated on a microchromatographic column packed with P350 levextrel resin and then eluted with a 4 g/L NaF eluent, resulting in a recovery of uranium of 98.6%-101.4%. The obtained uranium was determined by Arsenazo-Ⅲ spectrophotometry. The experimental conditions were optimized and discussed. The results of determination of iron ore samples from Baotou iron ore by the present method are in good agreement with the standard values. 