Development of a SISAK extraction system for chemical studies of element 108, hassium

作者：Samadani F^*; Alstad J; Bjornstad T; Stavsetra L; Omtvedt J P

来源：Radiochimica Acta, 2010, 98(12): 757-764.

DOI：10.1524/ract.2010.1787

• Transactindes
• Element 108
• Liquid-liquid extraction
• Super heavy elements
• SISAK
• One-atom at-a-time chemistry
• Hassate(VIII)

A liquid-liquid extraction system suitable for studies of chemical properties of Hs (element 108), in the form of HsO(4), was developed using gamma-emitting isotopes of its homologue Os 1 he system is targeted for the fast on-line extraction system SISAK which operates in a continuous manner and is suitable for liquid-phase studies of transactinide elements The distribution of Os, between various dilute NaOH solutions and toluene was studied Both batch and SISAK on-line experiments were performed to develop an appropriate system From analysis of the extraction curves equilibrium constants for the formation of the presumed complexes, Na[OsO(4)(OH)] and Na(2)[OsO(4)(OH)(2)], were obtained K(1) = (1 +/- 0 5) x 10(4) and K(2) = 12 +/- 8, respectively The SISAK system includes a liquid-scintillation detection system for a measurements Due to quenching effects it is not possible to perform direct measurement of the aqueous phase a's Therefore a two-stage extraction method that provides an indirect measurement of the activity in the aqueous phase was developed as part of the proposed system for Hs Acidification of the raffinate from the first stage result in recovery of OsO(4), which is highly extractable into toluene The yield of extraction in the second step, from 0 01 M NaOH solution after acidification with H(2)SO(4) solution was (90 +/- 3)%

• 出版日期2010