摘要
采用CL-7301树脂微色谱柱研究了铀化合物中基体铀和痕量镉的分离条件,并用在线富集法测定了铀化合物中的痕量镉。通过试验选择0.125mol/L的HI酸介质中,镉的吸附率接近100%,而铀不被吸附,分离效率达到99.9%以上。吸附在柱上的镉用10 g/LEDTA洗脱,原子吸收光度法测定。利用在线富集技术,镉的检出限降低至2.3μg/L。对八氧化三铀和分析纯醋酸双氧铀样品中痕量镉进行测定,方法精密度为1.5%,加标回收率为96%～98%。
The conditions of cadmium separated from matrix element uranium were studied by the CL-7301 resin microchromatographic-column, and trace cadmium in the uranium compounds was determined with on-line concentration technique. The results indicated that in the medium of 0. 125 mol/L HI, the adsorption efficiency of cadmium approached 100%, and uranium was not adsorbed at all, the separation efficiency achieved above 99.9%. The cadmium absorbed by the chromatographic-column was eluted by 1% EDTA, and then was determined by atomic absorption spectroscopy. With on-line concentration technique, the detection limit of cadmium was reduced to 2.3 μg/L. The method was used to determine the trace cadmium in U3O8 and UO2 （CH3O）2 ·2H2O. The precision was 1.7%, and recoveries were from 96 % to 98 %.
出处
《分析试验室》
CAS
CSCD
北大核心
2009年第1期72-75,共4页
Chinese Journal of Analysis Laboratory
