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| - Surface Complexation of Copper(II)on Soil Particles: EPR and XAFSStudies
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| - The interactions of transition metals with natural systemsplay an important role in the mobility and the bioavailabilityof these metals in soils. In this study, the adsorption of copper(II) onto natural soil particles was studied as a functionof pH and metal concentration. The retention capacity ofsoil particles was determined at pH 6.2 to be equal to 6.7 mgof copper/g of solid. The Langmuir and Freundlichisotherm equations were then used to describe thepartitioning behavior of the system at different pH values.A combination of EPR, extended X-ray absorption finestructure (EXAFS), and X-ray absorption near-edge structure(XANES) spectroscopies was used to probe the Cuatomic environment at the soil particles/aqueous interface.The spectroscopic study revealed that copper(II) ionsare held in inner-sphere surface complexes. It also revealedthat Cu was in an octahedral coordination with first-shell oxygen atoms. A weak tetragonal distortion waspointed out due to the Jahn−Teller effect, with a meanCu−Oequatorial bond distance of 1.96 Å and a Cu−Oaxialbond distance of 2.06 Å. A detailed analysis of thespectroscopic data suggested that Cu(II) was bonded toorganic matter coated onto the mineral fraction of soilparticles.
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