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Potential Mineralization of Four Herbicides in a Ground Water–Fed Wetland Area

DHI Water & Environment, Agern Allé 11, DK-2970 Hørsholm, Denmark

View larger version (72K): [in a new window]   Fig. 1. Topographic map of the wetland area indicating the transect. Ground water is recharged at the hillslope from where it flows parallel to the transect towards the recipient stream, Voldby stream. Samples were taken along the transect at Sites 0 and 5, and at two depths at Site 9. The arrow shows the ground water flow direction (redrawn from Dahl, 1995)

View larger version (16K): [in a new window]   Fig. 2. Chemical structure of (A) mecoprop, (B) metsulfuron-methyl, (C) isoproturon, and (D) atrazine

View larger version (15K): [in a new window]   Fig. 3. Mineralization of [ring-U-14C]herbicides to 14CO2 in the presence of various electron acceptors. () S0, aerobic; () S5, anaerobic + NO-3; () S9-I, anaerobic + SO2-4 + CO2; (x) S9-II, anaerobic + CO2