Estimation of Sediment Denitrification Rates at In Situ Nitrate Concentrations

The denitrification rates in a marine sediment, estimated by using 15N-nitrate, Vmax, Km, and sediment nitrate concentrations, were 12.5 and 2.0 nmol of N2-N cm−3 day−1 at 0 to 1 and 1 to 3 cm, respectively, at 12�C. The total rate was 165 nmol of N2-N m−2 day−1.