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海水中微量元素的活性炭吸附预浓集和中子活化分析 总被引:1,自引:0,他引:1
应用高分辨率的Ge(Li)γ谱仪,可以对天然水中的多种微量元素进行不破坏样品的中子活化分析,但要得到高的灵敏度,必须在活化前将水中待测元素预先浓集。冷冻干燥预浓集方法成功地用于各种天然淡水,而海水在冷冻干燥后会得到大量的混合盐(主要是NaCl),经过中子活化将产生很强的~(24)Na放射性,干扰其它元素的测定。因此,对于海水多数采用离子交換树脂吸附,溶剂萃取和活性炭吸附等预浓集方法。活性炭的优点是,对水中多种微量元素吸附能力很强,对Na,Cl和 相似文献
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Using neutron activation analysis method we determined contents of rare-earth and radioactive elements (La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Cs, Rb, Sb, Sc, Sr, Ba, U, Th) in source water system of the Changjiang (Yangtze) River, which is mainly composed of the Tuotuo River, the Chumaer River, and the Buqu River. The contents of these elements in the unflltered water have a great variation and a close correlation with the water turbidity. The contents of these elements in filtered water only have a little variation and are lower than those in the unflltered water. The variations in contents of these elements in sediments are also very little. These elements in the unifiltered water are in geometric distribution, except Sc. Most of the elements in sediments are in arithmetic distribution, but Cs, Sb, Th, are in deviation distribution. The contents of most of these elements in the river source area correspond to the contents of fresh water of the earth. Most of these elements have a little variation in their c 相似文献
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