Marin S, Cornejo S, Jara C, Duran N
Chilean Commission of Nuclear Energy, Lo Aguirre Nuclear Centre, Amunategui 95, Santiago, Chile.
Anal Bioanal Chem. 1996 Jun;355(5-6):680-3. doi: 10.1007/s0021663550680.
The determination was studied of Al, B, Be, Cd, Ca, Co, Cu, Mg, Mn, Mo, Pb, Si, Sn, V, Cr, Ni, and Fe as trace level impurities in uranium compounds by ICP-AES after extraction of uranium with three different mixtures of di-(2-ethyl-hexyl) phosphate (D2EHP) and tri-(2-ethyl-hexyl)-phosphate (T2EHP) in solvents like toluene, carbon tetrachloride, hexane and cyclohexane. The study was carried out in presence of different concentrations of HCl and HNO(3). A single extraction with D2EHP in cyclohexane using nitric acid as matrix was sufficient to reduce the U(3)O(8) concentration from 100 g/l to 100 microg/ml. The ICP-AES instrumentation applied, allowed the determination of metal concentrations ten-times lower than those usually found in nuclear grade U(3)O(8). To check the efficiency of the extraction and the accuracy of the proposed method, Certified Reference Materials were used in the dissolution and extraction steps. The method described can be used for the determination of trace metals in nuclear grade U(3)O(8).
通过电感耦合等离子体发射光谱法（ICP - AES），研究了在以甲苯、四氯化碳、己烷和环己烷为溶剂的二（2 - 乙基己基）磷酸酯（D2EHP）和三（2 - 乙基己基）磷酸酯（T2EHP）的三种不同混合物萃取铀之后，测定铀化合物中痕量水平的铝、硼、铍、镉、钙、钴、铜、镁、锰、钼、铅、硅、锡、钒、铬、镍和铁。该研究是在不同浓度的盐酸和硝酸存在下进行的。以硝酸为基质，在环己烷中用D2EHP进行单次萃取足以将U₃O₈浓度从100 g/l降至100 μg/ml。所应用的ICP - AES仪器能够测定比核级U₃O₈中通常发现的金属浓度低十倍的浓度。为了检验萃取效率和所提方法的准确性，在溶解和萃取步骤中使用了有证标准物质。所描述的方法可用于测定核级U₃O₈中的痕量金属。
