%0 Journal Article %T Batch copper ion binding and exchange properties of peat %+ Laboratoire de Bioélectrochimie et Analyse du Milieu (LABAM) %A Chen, Xiao-Hua %A Thierry, Gosset %A Thevenot, Daniel, R. %< avec comité de lecture %@ 0043-1354 %J Water Research %I IWA Publishing/Elsevier %V 24 %N 12 %P 1463-1491 %8 1990-04 %D 1990 %K peat %K metal cation %K ion exchange %K adsorption %K complexation equilibrium %K electroneutrality %Z Environmental SciencesJournal articles %X Cupric ion fixation by raw peat is likely involved in both cation exchange with H+, Ca++, Mg++ and adsorption-complexation i.e. fixation of the same equivalent of copper ions and anions (NO3-) without any ion release. The importance of both reactions depends largely on initial copper concentration, peat type and pH. Isotherms of copper (initial concentration ranging between 1 and 20 mM) fixation on two types of peat (eutrophic and oligotrophic peat at 30 g d.w./l at pH ranging between 2 and 4) showed that the higher the initial cupric concentration, the more important is this complexation reaction; over this initial cupric concentration range, ion exchange sites were relatively saturated and reached 308 and 101 mmol/kg d.w. for eutrophic and oligotrophic peat whereas no saturation was found for complexation sites, their capacity attaining up to 74 and 119 mmol/kg d.w. respectively.The apparent equilibrium constant for ion exchange with acid-treated peat (initial pH 4.0, 30 g d.w./l) for various metal binding on both peat sites range between 1.1 and 10.8 in 15 mM metallic solutions. The apparent affinity in batch conditions for 5 elements may be compared according to the apparent global equilibrium constants, ranging between 1.1x10-6 and 20.2x10-6: Pb > Cu > Ca > Mg, Zn for eutrophic peat and Pb > Ca > Cu > Mg, Zn for oligotrophic peat. %G English %2 https://enpc.hal.science/hal-01084540/document %2 https://enpc.hal.science/hal-01084540/file/Chen-Cu-Peat-Wat-Res-1990-24-12-1463-1471.pdf %L hal-01084540 %U https://enpc.hal.science/hal-01084540 %~ SDE %~ ENPC %~ PARISTECH %~ GIP-BE %~ UPEC %~ UNIV-EIFFEL %~ UPEM-UNIVEIFFEL