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Studies on Mobility and Degradation Pathways of Terbuthylazine Using Lysimeters on a Field Scale

Water Research Institute-CNR, via Reno 1, Roma, Italy

View larger version (25K): [in a new window]   Fig. 1. Comparison between terbuthylazine (TER) concentrations in water at 30- and 90-cm soil depths in the three experiments.

View larger version (21K): [in a new window]   Fig. 2. Natural rainfall in the third experiment.

View larger version (42K): [in a new window]   Fig. 3. Comparison between terbuthylazine (µg/L) and chlorine (mg/L) trends and the matrix potential values (mm Hg). Terbuthylazine (TER) and Cl- concentrations are on the left, while tensiometer values are on the right.

View larger version (35K): [in a new window]   Fig. 4. Transformation product (TP) concentrations in water at the 30-cm soil depth. DDA, deethyl-deisopropylatrazine; DDAH, desethyldeisopropyl-atrazine-2-hydroxide; DEAH, desethyl-atrazine-2-hydroxide; DET, deethylterbuthylazine; DETH, deethylterbuthylazine-2-hydroxide; DIA, deisopropylatrazine; DIAH, deiso-propylatrazine-2-hydroxide; TH, terbuthylazine-2-hydroxide.

View larger version (46K): [in a new window]   Fig. 5. Transformation product (TP) concentrations in water at the 90-cm soil depth. DDA, deethyl-deisopropylatrazine; DET, deethylterbuthylazine; DETH, deethylterbuthylazine-2-hydroxide; DIA, deisopropylatrazine; DIAH, deiso-propylatrazine-2-hydroxide; TH, terbuthylazine-2-hydroxide.

View larger version (16K): [in a new window]   Fig. 6. Desethylterbuthylazine (DET) to terbuthylazine (TER) ratios at 30- and 90-cm soil depths.

View larger version (24K): [in a new window]   Fig. 7. Terbuthylazine (TER) and desethylterbuthylazine (DET) concentrations in the soil samples.