Dissolved Cu(II) Speciation in Unpolluted Soil Solutions of a Planosolic Horizon |
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Authors: | Aurélie Pelfrêne Nathalie Gassama Daniel Grimaud |
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Institution: | GéEAC, UPRES EA‐2100, Université Fran?ois Rabelais Tours, UFR Sciences et Techniques, Parc de Grandmont, 37200?Tours, France |
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Abstract: | Dissolved Cu(II) speciation in unpolluted soil solutions from different horizons was studied using differential pulse anodic stripping voltammetry (DPASV). Three sites were selected according to topography and monitored for three years. Experiments evidence Cu(II) can be bound by DOM (Dissolved Organic Matter) through complexation and/or adsorption reactions. The complexation capacity and the corresponding conditional stability constant were determined for complexation reactions. The adsorbing sites were titrated. A potential binding coefficient was calculated to compare both types of reactions. Results show adsorption is less frequent than complexation but exhibits higher binding coefficient. |
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Keywords: | Copper speciation Differential pulse anodic stripping voltammetry (DPASV) Soil solutions |
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