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Abstract: The method of agitation has a great influence on the kinetics of adsorption of cobalt by synthetic geothite /agr-FeOOH/ suspended in 10–2 mol l–1 NaCl at pH 7. Three methods of agitation were compared, reciprocating shaking, continuous stirring and intermittent stirring, and only with the latter was equilibrium achieved. This suggests that in sorption systems with a solid phase subject to aggregation of particles the breakdown of aggregates can be prevented by intermittent stirring.