季铵萃淋树脂色谱分离-ICP/AES法测定核纯级UO_2中7种杂质元素

DETERMINATION OF 7 TRACE ELEMENTS IN NUCLEAR PURE URANIUM DIOXIDE BY 237-QUATERNARY AMMONIUM LEVEXTREL RESIN/ICP-AES

摘要: 应用237-季铵萃淋树脂色谱分离技术,将核纯级UO_2中铀与待测杂质元素在6.5 mol·l~(-1)HNO_3。介质中定量分离后,以975型ICP直读光谱仪同时测定Ba、Be、Nb、Ru、Sb、Sn和Ta。取样200mg时,测定下限为0.013×10~(-6)-0.50×10~(-6);当各元素含量约为1.0×10~(-6)时,方法的加入回收率在98％-103％范围内;相对标准偏差<5％。

Abstract: The 237-quternary ammonium levextrel resin chromatography is used to separate 7 trace ele-ments in nuclear pure uranium dioxide. The sample is dissolved in 6.5 mol/l HNO_3, and the ura-nium is separated by chromatographic column. The 7 trace elements Ba, Be, Nb, Ru, Sb, Snand Ta containing in the elutriant are determined using ICP direct reading spectrometer. With asample of 200 mg, the determination limit for all 7 elements is in the range of 0. 013×10~(-6)--0. 50×10~(-6), the recovery is 98%--103% and RSD<5%.