Supported by the National Natural Science Foundation of china(No.10075063, 10175079), Major State Basic Research Devel- opment Program (No.G2000077400), and the Chinese Academy of Sciences.
the National Natural Science Foundation of China(No.10075063 and 10175079);by the Chinese Academy of Sciences(TK95T-03)
The paper describes the solvent extraction of trace thorium from hydrochloric acid media by1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) using a radioactive tracer technique. The percent extraction ofthorium was stu...