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Changes in propionate, sulfate, acetate, sulfide, and methane during 514 days of incubation in sediment slurry enrichments constituted of sulfate zone sediment (A) Slurry P4, with 20 mM sulfate addition at 25 °C, (B) Slurry P8, with 20 mM sulfate addition at 10 °C, (C) Slurry P1, without sulfate addition at 25 °C, (D) Slurry P6, without sulfate addition at 10 °C. Arrows denote the time points for the additions of sulfate (red) and propionate (black).
