同位素稀释-火花源质谱法测定U_3O_8标样中8个微量元素

DETERMINATION OF EIGHT TRACE ELEMENTS IN U_3O_8 STANDARD REFERENCE MATERIAL BY ISOTOPE DILUTION SPARK SOURCE MASS SPECTROMETRY

建立了同位素稀释-火花源质谱法(ID-SSMS)测定U_3O_8中微量元素的分析方法。本方法具有灵敏、直接、多元素同时测定及绝对测量等特点。工作中对测量线对、最佳稀释条件和导电介质等的选择进行了研究。方法经分析IAEA SR-54 U_3O_8杂质标样得到了验证,为我国核工业研制的U_3O_8杂质标样中Mo,Cu,Fe,Ca,Pb,Ba,K和Zn八个微量元素提供了定值分析数据,测定值与整体中位值相符情况良好。相对均方偏差平均为11%。

An isotope dilution spark source mass spectrometric method (ID-SSMS) is de-veloped for the certification of trace elements in U_3O_8 standard reference material.The advantages of this method are:(a) high sensitivity and simple sample prepa- ration; (b) simultaneous determination of many elements; and (c) measurementsindependent of calibration standard and providing results of precise absolute ana-lysis. A detailed study is preformed for selections of the interferencelines,the opti-mum dilution condition and the conducting medium. In applying this method forthe certification of the trace elements Mo, Cu,Fe,Ca,Pb,Ba, K and Zn in domes-tic U_3O_8 standard reference material, the determined concentrations in the sampleare in good agreement with the medium values. The average of all relative stan-dard deviations is ±11%.