Transport of copper oxychloride-based fungicide particles in saturated quartz sand

Environmental Science & Technology
Paradelo MJ Eugenio Lopez-Periago

Abstract

Intensive use of copper-based fungicides in agriculture causes contamination of subsurface environment. While the transport of dissolved copper in porous media has been widely studied, transport mechanisms of particles of copper-based fungicides are poorly understood. This paper reports the results of tests involving the transport of colloid-size particles of a copper oxychloride-based fungicide (COF) in water-saturated quartz sand columns under varying electrochemical and hydrodynamic conditions. The effect of the ionic strength on colloid attachment and exclusion suggests that interactions of COF in water depend on the characteristics of the diffuse layer. Hydrodynamic shear influences the deposition of fungicide particles, indicating that attachment forces are weak. Particle deposition dynamics was well-fitted with the two-site kinetic attachment model, which reflects the heterogeneity of the quartz surface. Retention also occurs for unfavorable electrochemical conditions, which was attributed to stagnation zones arising from the physical and chemical heterogeneity of the quartz surface.

References

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Apr 5, 2003·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Manuel Quesada-PérezRoque Hidalgo-Alvarez
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Jun 26, 2008·Journal of Agricultural and Food Chemistry·M ParadeloJ Eugenio López-Periago

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Citations

Jul 26, 2011·Journal of Contaminant Hydrology·Marcos ParadeloJ Eugenio López-Periago
May 22, 2013·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Paula Pérez-RodríguezJosé Eugenio López-Periago
May 15, 2010·Journal of Agricultural and Food Chemistry·Marcos ParadeloJ Eugenio López-Periago

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