Method study on uranium determining in sandstone by ICP-MS
Đỗ Quốc Hùng, Hoàng Văn Dũng, Nguyễn Mạnh Hùng, Dương Đức Lâm, Lê Thị Mai Hương
To evaluate the content of uranium in Nông Sơn sandstone, the ICP-MS metthod is commonly used to determine the U content in ore. However, Nong Son sandstone ore consists of silicon minerals, so to determine the exact content of U in it, the optimum breaking method is the use of HF, H2SO4 and HNO3, In that HF lo evaporate silicon and the other two acids as a oxidizing agents. The optimum ratio of H2S04 HF/HN03 is (1/1/4, by volume) at 2 hr and temperature is 250°C. The results of the analysis of U in the saraple were compared with the results of the world-class "Soils & Hazardous Waste PT Scheme" round 95 conducted by the ERA (USA) origination and reached - 0.682 value in the range of -2 to +2.
Keytwords: ICP-MS, U, Nông Sơn sandstone, decomposition U ore.