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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 10, Number 1
JKCSEZ 10(1)
February 20, 1966 

Spectrophotometric determination of Cobalt by means of Co-EDTA butyl ester Complex

Ethylenediamine Tetrabutylacetate (EDTA butyl ester)에 의한 Co의 흡광광도분석
Doo Won Park

A new method of cobalt determination has been developed by employing ethylenediamine tetrabutyl acetate(EDTA-butyl ester) synthesized from EDTA and Butyl alcohol. The synthesized EDTA ester dissolved in butyl alcohol extracts various metal ions from aqueous solutions. Cobaltous ion extracted into organic phase containing EDTA ester to form Co (II)-EDTA butyl ester complex is back extracted into alkaline aqueous phase forming a stable pink colored complex of Co (III). The optimum condition for spectrophotometric determination of cobalt via the new complex has been established. The absorption peak occurs at 540mμ and Beer's law was obeyed over the concentration range of 0∼50 μg/ml of cobalt.
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