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(A) Rates of denitrification versus NO3− or NO2− concentrations with constant 110 μM 15NO3− (or 15NO2−) concentration in the overlying water column for sediment at site 2 of Colne estuary. Incubations were at 15°C in darkness using artificial seawater at a salinity of 15‰ in April 1998. The error bars indicate standard errors (n = 4). (B) Ratios of rates of nitrous oxide production and denitrification (N2O/N2 ×100) versus NO3− or NO2− concentrations in the water column.
