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Effects of Dissolved Organic Carbon on Sorption and Mobility of Imidacloprid in Soil

Department of Inorganic Chemistry, Univ. of Almería, La Cañada de San Urbano s/n, 04120, Almería, Spain

View larger version (19K): [in a new window]   Fig. 1. Chemical structure and physical and chemical properties of imidacloprid.

View larger version (11K): [in a new window]   Fig. 2. Sorption kinetic of imidacloprid, dissolved organic carbon extracts from peat (DOC-PE), and dissolved organic carbon extracts from tannic acid (DOC-TA) in batch studies. The initial concentration was 20, 49, and 50 mg L-1 for imidacloprid, DOC-PE, and DOC-TA, respectively.

View larger version (8K): [in a new window]   Fig. 3. Adsorption isotherm of imidacloprid on the calcareous soil.

View larger version (12K): [in a new window]   Fig. 4. Initial mass isotherm corresponding to dissolved organic carbon extracts from peat (DOC-PE) and dissolved organic carbon extracts from tannic acid (DOC-TA) on the calcareous soil.

View larger version (11K): [in a new window]   Fig. 5. Percentage variation of the amount of imidacloprid adsorbed in presence of dissolved organic carbon extracts from peat (DOC-PE) and dissolved organic carbon extracts from tannic acid (DOC-TA) relating to the amount adsorbed when no dissolved organic carbon is present.

View larger version (13K): [in a new window]   Fig. 6. Evolution of high performance liquid chromatography (HPLC) chromatogram corresponding to the mix solution of imidacloprid and dissolved organic carbon extracts from peat (DOC) from the beginning (—) to the end (- - -) of the adsorption process.

View larger version (20K): [in a new window]   Fig. 7. Curves obtained from the pulse experiment for bromide ions (), imidacloprid eluted with 0.01 M CaCl2 (), 0.01 M CaCl2 dissolved organic carbon extracts from peat (DOC-PE) (), and 0.01 M CaCl2 dissolved organic carbon extracts from tannic acid (DOC-TA) solutions ().