Separation scheme for selective and quantitative isolation of cobalt from neutron-irradiated biological materials by ion exchange and extraction chromatography

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Journal of Analytical Chemistry

OSTI ID:171757

Dybczynski, R; Danko, B; Maleszewska, H ^[1]

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1. Institute of Nuclear Chemistry and Technology, Warsaw (Poland)

Highly reliable radiochemical separation scheme for selective and quantitative isolation of trace amounts of cobalt from neutron-irradiated biological materials was elaborated. The method consists in wet-ashing of the sample with HNO{sub 3} + HClO{sub 4} (1:1) mixture plus vanadium salt (oxidation catalyst), removal of silica by evaporation with HF and separation of cobalt from accompanying ions successively on 3 columns with Dowex 1-X8[Cl{sup -}] from 0.5 M HCl, Dowex 1-X8[Cl{sup -}] from 8 M HCl + 2 M MgCl{sub 2} and tri-n-octylphosphine oxide (TOPO) supported on styrene-divinylbenzene copolymer, from 7 M HCl solution, respectively. Cobalt of very high radiochemical purity is finally recovered in 1.2 M HCl solution with practically 100% yield. The separation scheme is universally applicable, to biological samples of both animal and plant origin and was devised to become an integral part of the very accurate ({open_quotes}definitive{close_quotes}) method of cobalt determination by neutron activation analysis (NAA). Preliminary results on Co determination by NAA in some certified reference materials confirmed high reliability of the devised separation scheme.

• OSTI ID: 171757
• Journal Information: Journal of Analytical Chemistry, Journal Name: Journal of Analytical Chemistry Journal Issue: 1 Vol. 49; ISSN 1061-9348; ISSN JACTE2
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
BIOLOGICAL MATERIALS
CATALYST SUPPORTS
CATALYSTS
CHEMICAL REACTION YIELD
COBALT
EXTRACTION CHROMATOGRAPHY
ION EXCHANGE
IRRADIATION
NEUTRON ACTIVATION ANALYSIS
SAMPLE PREPARATION
WET ASHING