Influence of sediment and pore-water composition on nitrite accumulation in a nitrate-Perfused freshwater sediment

摘要

anaerobic nitrate consumption was accompanied by the accumulation of nitrite in the range of 3-52 μmoll~-1 in laboratory sediment cores continuously perfused with nitrate from below. Highest interstitial nitrite concentrations were observed in organically poor sediment cores with a low extractable protein content. Supplemented with an additional source of fixed nitrogen (ammonium), the nitrate- perfused sediments exhibited considerably lower nitrite concentration than the respective control treatments.