Recently, Sawalha et al. [M.F. Sawalha, J.R. Peralta-Videa, J. Romero-Gonzalez, M. Duarte-Gardea, J.L. Gardea-Torresdey, J. Chem. Thermodyn. 39 (3) (2007) 488-492] presented characterisation of the biosoption of Cu(II), Pb(II), and Zn(II) onto the saltbush leaves (Atriplex caneseens) at 297 K and pH 5.0. However, the model application and some thermodynamic calculations were problematic or erroneous. (C) 2007 Elsevier Ltd. All rights reserved.