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Microprofiles of pH, ΣH2S and NOx− measured in sediment incubated for 64 days under anoxic overlying water in the presence of 235 μM NO3− in November 2011. Data are shown as mean±s.e.m. (n=3). Dotted lines represent single pH profiles measured after 7, 18, 34 and 53 days of incubation. Gray bars represent pooled intracellular and free NO3− extracted from frozen and thawed sediment samples. Data are shown as mean±s.e.m. (n=3).
