Because of the special feature with the multivalences,multi-mass number and larger isotopic fractionation,Se isotopes have caused more attention.

The isotopic fractionation under microbial actions belongs to the kinetic isotopic fractionation,which results in the enrichment of heavier isotopes in .

There exist possible isotopic fractionation effects in generation-expulsion process of terrestrial source rocks.

Through acetone via 2,4-dinitrophenylhydrazine(DNPH)derivatization,it was found that isotope fractionation values were so little as to be ignored during the whole reaction process,the derivatization process showed that no carbon isotope fractionation occurred for acetone within the precision limits of the GC/C/IRMS system(<0.

The researchful status of the isotope fractionation the stable isotopes in tracing to sources and trailing pollutant,specially in apportioning the atm.

In addition,the experiment working standard of H2 was certified by H2 /H2O(l) equlibrium H/D isotope analysis associating with hydrogen isotope fractionation equilibrium.

The cryogenic preparation gas chromatography method for the use of hydro-gen isotope separation was introduced in the paper.

A new method is presented to measure the atomic flux for atomic vapor laser isotope separation.

he value function and the separative power are very important physicalquantities in the field of the uranium isotope separation.

Determination of Parameters of Reaction Cell for Chemical reaction isotope seperation by a laser activation and the influence on separation coefficient;