Progress in neutron activation analysis for uranium

被引：0

作者：

Du, HS ^{[1
]}

Li, GQ ^{[1
]}

Dong, GH ^{[1
]}

Li, JL ^{[1
]}

Chiu, KH ^{[1
]}

Wai, CM ^{[1
]}

机构：

[1] UNIV IDAHO,DEPT CHEM,MOSCOW,ID 83843

来源：

SCIENCE IN CHINA SERIES B-CHEMISTRY | 1996年 / 39卷 / 02期

关键词：

uranium; preconcentration; neutron activation analysis;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A new type of extractant, sym-dibenzo-16-crown-5-oxyhydroxamic acid (HL) is introduced. The extractions of UO22+, Na+, K+, Sr2+, Ba2+ and Br- were studied with HL in chloroform The results obtained show that UO22+ on be quantitatively extracted at pH values above 5, whereas the extractions of K+, Na+, Sr2+, Ba2+ and Br- are negligible in the pH range of 2-7. The dependence of the distribution ratio of U(VI) on both the concentration of the HL and pH are linear, and they have the same slope of 2. This suggests that U(VI) appears to form a 1:2 complex with ligand. Uranium(VI) on be selectively separated and concentrated from interfering elements such as Na, K, Sr and Br by solvent extraction with HL under specific conditions. The recovery bf uranium is nearly 100% and the radionuclear purity of uranium is greater than 99.99%. Therefore, neutron activation analysis has greatly improved the sensitivity and accuracy for the detection of trace uranium from seawater.

引用

页码：219 / 224

页数：6