Table 3.

Fluxes through the aggregate-bulk liquid interface calculated from microprofiles

Conditions and sampleMean ± SD flux (nmol · mm−2 · h−1)a (no. of profiles)
OxygenAmmoniumNitriteNitrate
In situb
 A1−4.67 ± 1.02 (5)−1.83 ± 0.86 (3)−0.16 ± 0.02 (3)2.06 ± 0.11 (4)
 A2−3.62 ± 0.96 (4)−1.30 ± 0.43 (4)−0.16 ± 0.05 (3)1.46 ± 0.14 (3)
 A3−0.44 ± 0.02 (3)Not detectable−0.23 ± 0.07 (3)0.62 ± 0.01 (3)
Incubationc
 A1−13.70 ± 5.50 (7)−6.69 ± 3.84 (3)3.18 ± 0.92 (3)4.03 ± 0.52 (3)
 A2−9.78 ± 2.49 (4)−4.60 ± 3.29 (4)0.34 ± 0.04 (3)3.85 ± 3.15 (5)
 A3ammonium −1.51 ± 0.01 (3)−0.62 (1)0.00 (2)0.62 (2)
 A3nitrite −4.13 ± 2.51 (3)No NH4 +present−6.09 ± 1.02 (3)5.60 ± 2.47 (3)
  • a 95% confidence limit.

  • b In situ conditions were as measured in the reactor (Table 1).

  • c For samples A1, A2, and A3ammonium, incubation conditions were 300 μM ammonium (pH 8.0) air saturation; for sample A3nitrite, incubation conditions were 300 μM nitrite (pH 8.0) air saturation.