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Influence of Soil Characteristics on Copper Sorption from a Copper Oxychloride Fungicide

Pose, Eva, Rial-Otero, Raquel, Paradelo, Marcos, Lopez-Periago, J. Eugenio
Journal of agricultural and food chemistry 2009 v.57 no.7 pp. 2843-2848
copper oxychloride, fungicide residues, copper, sorption, adsorption, agricultural soils, soil pollution, acid soils, cation exchange capacity, soil pH
The objective of this work was to assess the sorption of copper (Cu) applied as a Cu-oxychloride metalaxyl formulation by soils characterized by anthropogenic accumulation of Cu due to agricultural activity. The methods involved batch incubation of soils with a Cu-oxychloride metalaxy-based fungicide suspended in 0.01 M CaCl2, phase separation, and determination of the concentration of Cu (Cu) in solution. Results showed that specific soil properties influenced solubilization of the Cu from the fungicide. The amount of dissolved Cu depended on the soil pH, its potential acidity, and its cation exchange capacity. The amount of anthropogenic Cu in the soil had a minor influence on soluble Cu after the addition of the fungicide. Thus, Cu-based antifungal treatment can increase the local concentration of soluble Cu in acid soils but is not likely to affect the [Cu] in moderately acidic or neutral soils.