The effect of temperature on acid and metals binding was studied using a commercial chelating adsorbent CuWRAM (R) (by Purity Systems Inc., USA) which contains 2-(aminomethyl)pyridine (AMP) ligands on a polyamine-silica composite. The binding equilibria in synthetic copper and nickel sulfate solutions and authentic multimetal process solutions were measured at 25-90 degrees C in batch experiments using potentiometric and spectroscopic methods. Experimental data were correlated with a non-ideal competitive adsorption (NICA) model. According to the results, the binding enthalpy is negative for both sulfuric acid and metal sulfates. Basicity and metals binding strength of the adsorbent thus decrease with temperature. The affinity for copper remains sufficiently high even at 90 degrees C to ensure high uptake selectivity from a concentrated ZnSO(4) solution. At the same time the amount of metal adsorbed remains constant or even increases with increasing temperature. (C) 2009 Elsevier Ltd. All rights reserved.