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Fig. 1. (a) Nitrate reduction to NH4+ and NO2– by FeO(s) at a constant pH 6.45. The small inset shows NO2– reduction by FeO(s) in a separate experiment over a 4-h interval under similar conditions. (b) Production of NH4+ vs. consumption of NO3– for the reaction of NO3– with FeO(s) at a constant pH 6.45. The solid line represents a linear least square regression fit of the data. Error bars indicate ±range of duplicate runs; bars not visible are smaller than the symbols.
