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Environmental Fate of Triasulfuron in Soils Amended with Municipal Waste Compost

^a Department of Chemistry, University of Malta, Msida MSD06, Malta
^b Dipartimento di Scienze Agroambientali e della Produzione Vegetale, University of Perugia, Borgo XX Giugno, 72, Perugia 06121, Italy

View larger version (41K): [in a new window]   Fig. 1. Adsorption isotherms of triasulfuron on (a) Filoncia and (b) Molinaccio soils in the presence and absence of compost, humic acids (HA), fulvic acids (FA), and hydrophobic dissolved organic matter (HoDOM). Error bars represent SE.

View larger version (18K): [in a new window]   Fig. 2. Isotherm for the association of triasulfuron to hydrophobic dissolved organic matter (HoDOM) from municipal soil waste compost. Error bars represent SE < symbol size.

View larger version (22K): [in a new window]   Fig. 3. Representative isotherms for the sorption of hydrophobic dissolved organic matter (HoDOM) to two soils. Error bars represent SE.

View larger version (23K): [in a new window]   Fig. 4. Comparative hydrolytic degradation pattern of triasulfuron in water at different pH values, in the presence and absence of humic acids (HA), fulvic acids (FA), and hydrophobic dissolved organic matter (HoDOM).

View larger version (21K): [in a new window]   Fig. 5. Chromatograms of triasulfuron and simultaneous appearance of hydrolytic products on different days from acid hydrolysis aqueous experiment at pH 4.5. The arrows indicate retention times for triasulfuron (T) and hydrolysates (H).

View larger version (20K): [in a new window]   Fig. 6. Kinetics of triasulfuron degradation in amended and nonamended (a) Filoncia and (b) Molinaccio soils. Error bars represent 95% confidence interval.