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Surface Retention and Photochemical Reactivity of the Diphenylether Herbicide Oxyfluorfen

^a Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy
^b Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece

View larger version (12K): [in a new window]   Fig. 1. Illustration of scheme showing the structure of oxyfluorfen and photo-derivative products identified in liquid phase. From Scrano et al. (1999a).

View larger version (24K): [in a new window]   Fig. 2. Reduction of oxyfluorfen extractable in methanol from treated soils kept in the dark, as percent of added herbicide (3 mg kg–1). Error bars represent the standard deviations of three replicate samples.

View larger version (27K): [in a new window]   Fig. 3. Reaction rate of oxyfluorfen retained on Preveza soil as percent of disappeared herbicide with respect to the added quantity (3 mg kg–1).

View larger version (27K): [in a new window]   Fig. 4. Reaction rate of oxyfluorfen retained on Nea Malgara soil as percent of disappeared herbicide with respect to the added quantity (3 mg kg–1).

View larger version (24K): [in a new window]   Fig. 5. Evolution of Metabolites 2 and 4 extracted from Preveza soil. Data have been reported as percent of their gas chromatography–mass spectrometry (GC–MS) peak area, calculated with respect to oxyfluorfen area in the same soil sample scraped from the TLC plate.

View larger version (25K): [in a new window]   Fig. 6. Evolution of Metabolites 2 and 4 extracted from Nea Malgara soil. Data have been reported as percent of their gas chromatography–mass spectrometry (GC–MS) peak area, calculated with respect to oxyfluorfen area in the same soil sample scraped from the TLC plate.