title: Influence of soluble copper on the electrokinetic properties and transport of copper oxychloride-based fungicide particles.
abstract: This article describes the influence of dissolved copper on the electrokinetic properties and transport of a copper oxychloride-based fungicide (COF) in porous media. The Zeta potential (ζ) of COF particles increases (viz. becomes less negative) with increasing concentration of Cu(2+) in the bulk solution. ζ decreases for COF when the electrolyte (NaNO(3)) concentration is raised from 1 to 10mM. This can be ascribed to ion correlation of Cu(2+) in the electrical double layer (EDL). COF transport tests in quartz sand columns showed the addition of Cu(2+) to the bulk solution to result in increased retention of the metal. Modelling particle deposition dynamics provided results consistent with kinetic attachment. Based on the effect of soluble Cu on colloid mobility, the transport of particulate and soluble forms of copper is coupled via the chemistry of pore water and colloid interactions. Mutual effects between cations and colloids should thus be considered when determining the environmental fate of particulate and soluble forms of copper in soil and groundwater (especially at copper-contaminated sites).
authors.affiliation: Department of Plant Biology and Soil Science, Faculty of Sciences, University of Vigo, Ourense, Spain. mparadelo@uvigo.es
authors.forename: Marcos
authors.initials: M
authors.lastname: Paradelo
authors.forename: Adrian
authors.initials: A
authors.lastname: Letzner
authors.forename: Manuel
authors.initials: M
authors.lastname: Arias-Estévez
authors.forename: Beatriz
authors.initials: B
authors.lastname: Garrido-Rodríguez
authors.forename: J Eugenio
authors.initials: JE
authors.lastname: López-Periago
mesh_terms: D003102:Colloids; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D005659:Fungicides, Industrial / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009994:Osmolar Concentration; D012822:Silicon Dioxide / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry*; D012995:Solubility
chemical_list: D003102:Colloids; D005659:Fungicides, Industrial; D012989:Soil Pollutants; D012822:Silicon Dioxide; C007120:copper oxychloride; D003300:Copper