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Accurate Determination of Cobalt in South African Primary and Secondary Geochemical Reference Materials by Cation Exchange Chromatography and Atomic Absorption Spectrometry
Author(s) -
VICTOR A.H.
Publication year - 1986
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.1986.tb00802.x
Subject(s) - cobalt , chemistry , hydrochloric acid , atomic absorption spectroscopy , acetone , ion exchange , ion exchange resin , analytical chemistry (journal) , chromatography , inorganic chemistry , ion , organic chemistry , physics , quantum mechanics
Cobalt in the six S.A. primary (NIMROCS) and fourteen secondary reference samples as well as in a phosphate rock has been determined accurately by means of atomic absorption spectrometry. A selective and quantitative ion exchange separation procedure, using a 20 g column of AG50W‐X8 cation exchange resin and 0.4 M hydrochloric acid‐86% acetone and 1 M hydrochloric acid‐80% acetone as eluting agents, is employed for the separation of cobalt from all other elements. The accuracy and precision of the described method are demonstrated by the analysis of synthetic rock solutions containing various amounts of cobalt. Amounts of 1, 10 and 100 μg of cobalt can be determined with a coefficient of variation of 1%, 0.3% and 0.2%. respectively.