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Size Distribution of Organic Matter and Associated Propiconazole in Agricultural Runoff Material

^a Dep. of Soil and Water Sciences, Agricultural Univ. of Norway, P.O. Box 5028, 1432-Ås, Norway
^b Inst. of Terrestrial Ecology, ETH Zurich, Grabenstrasse 3, CH-8952 Schlieren, Switzerland

View larger version (12K): [in a new window]   Fig. 1. Chemical structure of propiconazole and its water solubility (S), acidity (pKa), 1-octanol/water partition coefficient (Koc), and volatility.

View larger version (22K): [in a new window]   Fig. 2. Flow-chart for the size fractionation method.

View larger version (33K): [in a new window]   Fig. 3. Particle–aggregate-size distribution of agricultural runoff sediment in a sediment–water suspension with a concentration of 50 g L-1. Samples with H2O2 treatment were size fractionated down to 2 µm.

View larger version (39K): [in a new window]   Fig. 4. Distribution of organic C in size fractions of the runoff sediment, expressed as percentage of total organic C.

View larger version (16K): [in a new window]   Fig. 5. Sorption and desorption isotherms of propiconazole for the bulk sediment sample; Cs: sorbate concentration in solid phase and Ceq: sorbate concentration in aqueous phase; sediment/water ratio 1:5, temperature 20°C.

View larger version (18K): [in a new window]   Fig. 6. Amount of pesticides sorbed to sediment in relation to distribution coefficient (Kd) and sediment concentration in suspension; curves are calculated based on linear sorption equilibrium; the figure on the right side is in an enlarged scale range.