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Preconcentration and Determination of Cobalt(II) in Natural Waters using Silica Gel Loaded with 2-Mercaptobenzothiazole  

Choi, Jong-Moon (Department of Environmental Engineering, Donghae University)
Choi, Hee-Seon (Department of Chemistry, The University of Suwon)
Publication Information
Analytical Science and Technology / v.17, no.6, 2004 , pp. 532-535 More about this Journal
Abstract
A method on the determination of Co(II) after adsorbing of Co(II) on 2-mercaptobenzothiazole-loaded silica gel was studied. The conditions on the separation of Co(II) such as pH of solution, the amount of 2-mercaptobenzothiazole, the flow rate for adsorption, and the desorption solvent were optimized to 9.0, 0.05 g, $10mL\;min^{-1}$ and 1 M $HNO_3$ in ethanol, respectively. Under these optimum conditions, the calibration curve of Co(II) was obtained over concentration range of $2{\sim}120ng\;mL^{-1}$. The detection limit was $0.6ng\;mL^{-1}$. Recovery yields of Co(II) in various natural water samples were more than 90%.
Keywords
cobalt; 2-mercaptobenzothiazole; silica gel; preconcentration;
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