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

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