含铀砂岩试样的预处理和铀钍同时测定方法研究

The research on pre-processing method of uranium bearing sandstone specimen and simultaneously detecting of uranium and thorium

研究了含铀砂岩试样的预处理方法，采用过氧化钠熔融，CTMAB凝聚，有效地消除了硅酸溶胶对铀钍分离富集的影响，与示波极谱法衔接，同时测定铀钍。铀钍的线性范围为0．001～0．500μg／10mL，检出限铀为8．63×10^-6μg／mL，钍为5．16×10^-6μg／mL。本法用于砂岩型铀矿中铀钍含量小于5×10^-6样品的连续测定，结果满意。

A pre-processing method was researched for uranium bearing sandstone specimen. Specimen was resolved with sodium peroxide and anglomercted with CTMAB, so as to eliminate the effection of silica acid gel to the separation and concentration of uranium and thorium connected with polaragraphic, the uranium and thorium can be determined simultaneously. Linearity for uranium and thorium were found in ranges of 0. 001-0. 500 μg/10mL with their detection limits of 8.63 ×10^-6μg/mL and 5.16 ×10^-6μg/mL. This method has been used in the continuous determination of uranium and thorium with the content less than 5×10^-6 in sandstones-type uranium deposit and satisfactory results has been gotten.