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The adsorption of Fuchsin Basic (FB) on copper surfaces in citric acid solutions whose concentrations ranged from 0.001 to 0.1 M was investigated using gravimetric measurements. The concentrations of FB studied ranged from 1 × 10-5 to 1 × 10-1 M with adsorption experiments being conducted at temperatures from 298 K 328 K. The adsorption mechanism is discussed in terms of the applicability of the conventional Frumkin, Bockris-Swinkels and Kastening- Holleck isotherms, amongst others. The best fit was obtained using the Frumkin isotherm model. A thermodynamic/kinetic model of adsorption was also fitted.Peer Reviewe