A modified method for the determination of uranium in Nb/Ta minerals by LED fluorimetry期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A modified method for the determination of uranium in Nb/Ta minerals by LED fluorimetry

Authors:	Pradhan Susanta Kumar Ambade Balram

Affiliation:	1.Chemical Laboratory, Department of Atomic Energy, Atomic Minerals Directorate for Exploration and Research, Eastern Region, Khasmahal, Jamshedpur, 831002, India ;2.Department of Chemistry, National Institute of Technology, Jamshedpur, 831014, India ;

Abstract:	A modified LED fluorimetry determination of uranium in Nb/Ta minerals has been developed. The mineral is brought into solution by fusion with mixed phosphate flux (NaH₂PO₄, H₂O and Na₂HPO₄). Iron quenches uranium fluorescence when it is present above the ratio of (iron to uranium) 100. Uranium is separated in ethyl acetate by solvent extraction and then stripped back into pyrophosphate buffer (pH ~ 7) prior to its LED fluorimetry determination. This modified method has been applied for the determination of uranium in synthetic mixtures and Nb/Ta minerals including Certified Reference Materials (X1807) with high degree of accuracy and precision.

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