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Bentazone leaching in Spanish soils


, : Bentazone leaching in Spanish soils. Pesticide Science 47(1): 7-15

Adsorption, incubation and soil-column experiments with bentazone (3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide) were carried out in ten different soils from the marches surrounding the Donana National Park (Huelva, SW Spain). Adsorption isotherms for the different soils showed a good fit with the Freundlich equation. Bentazone was poorly adsorbed in all the soils studied, with no significant relationship between the K-f values and soil characteristics. A significant correlation was obtained between the soil organic matter content and the distribution constant values (K-d) calculated at an equilibrium concentration of 200 mu-g cm-3. The low adsorption and non-degradation of bentazone on these soils suggest that the herbicide readily percolates through soils to reach the surface and ground waters. The mobility of bentazone through three soil columns was also studied. The mass balances carried out showed that bentazone was totally eluted from the soil columns. The theoretical model applied to explain bentazone leaching under our experimental conditions seems to be suitable for soil columns with a uniform water-flow rate.

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Accession: 002763885

DOI: 10.1002/(sici)1096-9063(199605)47:1<7::aid-ps377>3.0.co;2-z

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