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Bacterial Degradation of Atrazine in Redox Potential Gradients in Fixed-Film Sand Columns

^a Environ. Sci. Graduate Program, The Ohio State Univ., Columbus, OH 43210-1085 (present address: Dep. of Civil and Environ. Engineering, Univ. of Illinois, Urbana, IL 61801) USA
^b School of Natural Resour., The Ohio State Univ., Columbus, OH 43210-1085 USA
^c Dep. of Microbiol., The Ohio State Univ., 484 West 12th Ave., Columbus, OH 43210-1292 USA

View larger version (31K): [in a new window]   Fig. 1 Sand column design employed in redox potential gradient studies

View larger version (21K): [in a new window]   Fig. 2 Activity of M91-3 in atrazine- and NO-3–containing medium in a sand-column microcosm that was aerated through the gas inlet (Port 6) (Experiment I). (A) atrazine concentration, (B) redox potential, and (C) NO-3 concentration

View larger version (28K): [in a new window]   Fig. 3 Activity of M91-3 in atrazine- and NO-3–containing medium in a sand-column microcosm with anaerobic conditions (Experiment II). Na2S (0.5 mL of 2.5% Na2S·9H2O) was added through each of the three sampling ports. Subsequent additions were 0.1 mL of the Na2S solution to Port 5 at 24 h and 0.25 mL to Port 1 at 36 h and 51 h to maintain low redox potential conditions. (A) atrazine concentration, (B) redox potential, (C) NO-3 concentration, and (D) pH

View larger version (30K): [in a new window]   Fig. 4 Activity of M91-3 in atrazine- and NO-3–containing medium in a sand-column microcosm with reduced conditions in the bottom zone (Experiment III). Na2S (0.5 mL of 2.5% Na2S·9H2O) was added through Port 5 at the beginning of the experiment. (A) atrazine concentration, (B) redox potential, and (C) pH

View larger version (22K): [in a new window]   Fig. 5 Activity of M91-3 in atrazine-containing medium (without NO-3) in a sand-column microcosm with reduced conditions in the bottom zone (Experiment IV). Na2S (0.5 mL of 2.5% Na2S·9H2O) was added through Port 5 at the beginning of the experiment. (A) atrazine concentration, (B) redox potential, and (C) pH

View larger version (35K): [in a new window]   Fig. 6 Activity of M91-3 in atrazine-, glucose-, and NO-3–containing medium in a sand-column microcosm with reduced conditions in the bottom zone (Experiment V). Na2S (0.5 mL of 2.5% Na2S·9H2O) was added through Port 5 at the beginning of the experiment. (A) atrazine concentration, (B) redox potential, (C) NO-3 concentration, (D) NO-2 concentration, and (E) pH

View larger version (23K): [in a new window]   Fig. 7 Activity of M91-3 in atrazine- and glucose-containing medium (without NO-3) in a sand-column microcosm with reduced conditions in the bottom zone (Experiment VI). Na2S (0.5 mL of 2.5% Na2S·9H2O) was added through Port 5 at the beginning of the experiment. (A) atrazine concentration, (B) redox potential, and (C) pH