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Sorption of Pesticides Atrazine, Isoproturon, and Metamitron in the Vadose Zone

UMR INAPG/INRA Environment and Arable Crops, B.P. 01, 78850 Thiverval-Grignon, France

View larger version (23K): [in a new window]   Fig. 1. Geological cross-section of the Bruyères-et-Montbérault catchment in northern France, showing locations of the three vadose zone drillings.

View larger version (22K): [in a new window]   Fig. 2a. Adsorption coefficients Kds and stratigraphy of vadose zone Profile A (see Fig. 1 for its location within the catchment). Vertical bars around symbols indicate the layers where the samples were taken. Each sample is identified by a code between each graph and its corresponding stratigraphic log. Note that the horizontal scales differ among the three vadose zone profiles of Fig. 2.

View larger version (27K): [in a new window]   Fig. 2b. Adsorption coefficients Kds and stratigraphy of vadose zone Profile B (see Fig. 1 for its location within the catchment). Vertical bars around symbols indicate the layers where the samples were taken. Each sample is identified by a code between each graph and its corresponding stratigraphic log. Note that the horizontal scales differ among the three vadose zone profiles of Fig. 2.

View larger version (29K): [in a new window]   Fig. 2c. Adsorption coefficients Kds and stratigraphy of vadose zone Profile C (see Fig. 1 for its location within the catchment). Vertical bars around symbols indicate the layers where the samples were taken. Each sample is identified by a code between each graph and its corresponding stratigraphic log. Note that the horizontal scales differ among the three vadose zone profiles of Fig. 2.

View larger version (12K): [in a new window]   Fig. 3. Map in the (1,2) principal components plane of the seven groups that resulted from clustering the 30 vadose zone samples according to the similarity of their Kds and other physicochemical properties (see text for explanation).

View larger version (16K): [in a new window]   Fig. 4. Graphs of the Kds (atrazine Kd [KdAtr], isoproturon Kd [KdIso], metamitron Kd [KdMet]) and other physicochemical properties (clay [Cl], fine silt [fL], coarse silt [cL], fine sand [fS], coarse sand [cS], organic C [OrgC] contents) of the vadose zone in the (a) (1,2) and (b) (1,3) planes of the principal components (see text for details).

View larger version (18K): [in a new window]   Fig. 5. Sorption isotherms of (a) atrazine, (b) isoproturon, and (c) metamitron on six representative vadose zone samples. Dashed lines show fitted linear isotherms.