title: Solid-solution partitioning of Cd, Cu, Ni, Pb, and Zn in the organic horizons of a forest soil.
abstract: We report the solid-liquid partitioning of Cd, Cu, Ni, Pb, and Zn in 60 organic horizon samples of forest soils from the Hermine Watershed (St-Hippolyte, PQ, Canada). The mean Kd values are respectively 1132, 966, 802, 3337 and 561. Comparison of those Kd coefficients to published compilation values show that the Kd values are lower in acidic organic soil horizons relative to the overall mean Kd values compiled for mineral soils. But, once normalized to a mean pH of 4.4, the Kd values in organic soil horizons demonstrate the high sorption affinity of organic matter, which is either as good as or up to 30 times higher than mineral soil materials for sorbing trace metals. Regression analysis shows that, within our data set, pH and total metal contents are not consistent predictors of metal partitioning. Indeed, metal sorption by the solid phase must be studied in relation to complexation by dissolved organic ligands, and both processes may sometime counteract one another.
authors.affiliation: Department of Chemistry, Université de Montréal, P.O. 6128, Succursale Centre-Ville, Montreal, Quebec, Canada H3C 3J7. sebastien.sauve@umontreal.ca
authors.forename: Sébastien
authors.initials: S
authors.lastname: Sauvé
authors.forename: Sylvie
authors.initials: S
authors.lastname: Manna
authors.forename: Marie-Claude
authors.initials: MC
authors.lastname: Turmel
authors.forename: André G
authors.initials: AG
authors.lastname: Roy
authors.forename: François
authors.initials: F
authors.lastname: Courchesne
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis*; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000032:analysis*; D011792:Quebec; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D014197:Trees
chemical_list: D019216:Metals, Heavy; D009930:Organic Chemicals; D012989:Soil Pollutants