Sorption of penconazole applied as a commercial water-oil emulsion in soils devoted to vineyards.

E Pose-Juan, R Rial-Otero, J E López-Periago

Nutrition and Bromatology Group, Analytical and Food Chemistry Department, Faculty of Sciences, University of Vigo, E-32004 Ourense, Spain.

Journal of hazardous materials 2010 Oct 15

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The objective of this work was to assess the effect of surfactants and oils of a commercial formulation on the potential mobility of penconazole in agricultural soils that have been subjected to a high rate of application of agricultural chemicals. Soil-water partition tests on a commercial water-oil emulsion formulation of penconazole (WOEP) in 0.01 M CaCl(2) containing 35 mg L(-1) penconazole, incubated for 24 h, showed a maximum retention of approximately 250-300 mg penconazole kg(-1) soil. Approximately 70% of the total penconazole retained by the solid phase was sorbed on the soil (175-200 mg kg(-1)). The other 30% was retained by the adjuvants present in the commercial formulation. The formulation also influenced the water-soil partition, increasing the sorption in tests on batch studies using technical-grade penconazole (TGP). Soils with high total copper and organic matter had the greatest affinity for penconazole when added as WOEP. Additionally, adsorption of penconazole followed an S-type isotherm, whose behavior was consistent with the ability of the technical-grade penconazole to form aggregates. In the case of the WOEP, the S-type behavior could be attributed to the surfactant present in the formulation, which could be adsorbed onto soil as hemimicelles, which in turn may facilitate adsorption of penconazole. 2010 Elsevier B.V. All rights reserved.

Citation

E Pose-Juan, R Rial-Otero, J E López-Periago. Sorption of penconazole applied as a commercial water-oil emulsion in soils devoted to vineyards. Journal of hazardous materials. 2010 Oct 15;182(1-3):136-43