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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, 10 mL 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～ 120 ng mL^(-1). The detection limit was 0.6 ng mL^(-1). Recovery yields of Co(Ⅱ) in various natural water samples were more than 90%.
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