Analytical and Environmental Chemistry Laboratory, School of Mineral Resources Engineering , Technical University of Crete , 73100 Chania , Greece.
Department of Environmental Radioactivity Monitoring , Greek Atomic Energy Commission , 15310 Athens , Greece.
Anal Chem. 2018 Apr 3;90(7):4611-4615. doi: 10.1021/acs.analchem.7b05115. Epub 2018 Mar 21.
The complexation of U and U in tap water and seawater after the use of a selective membrane was examined. At the first step, many ligands were used for original membranes preparation and their yields in uranium analysis were evaluated by X-ray fluorescence, in order to select the ligand with the highest uranium selectivity in water samples. At the second step the new prepared membrane was used for uranium analysis by α-spectrometry. Various factors were tested for a more effective uranium binding such as a membrane's active surface, water sample volume, equilibration time, and stirring during the process. After membrane complexation, uranium was separated by anion exchange and electroplated onto stainless steel plates in order to prepare suitable α-ray sources; these sources were measured by α-spectrometry and gave high chemical uranium recoveries and very good energy resolution spectra. The method can successfully be applied even for relatively small sample volumes and seawater samples.
考察了使用选择性膜后自来水中和海水中 U 和 U 的络合情况。在第一步中，使用了许多配体来制备原始膜，并通过 X 射线荧光法评估它们在铀分析中的产率，以选择在水样中具有最高铀选择性的配体。在第二步中，通过 α 谱法使用新制备的膜进行铀分析。测试了各种因素以实现更有效的铀结合，例如膜的活性表面、水样体积、平衡时间和过程中的搅拌。膜络合后，铀通过阴离子交换分离并电镀到不锈钢板上，以制备合适的α射线源；这些源通过α谱法进行测量，给出了高的化学铀回收率和非常好的能谱分辨率。该方法即使对于较小的样品体积和海水样品也能成功应用。
