TABLE 2

Rates of acetylene reduction in microcosms containing sediment samples from PS

TreatmentAvg acetylene reduction rate (C2H4 nmol gdm−1 h−1) ± SDa
Unamended25 ± 2.2
NH4+c9.3 ± 0.81
ATUdBDLb
NH4+ + ATU0.60 ± 0.020
  • a Assays were performed in triplicate.

  • b BDL, below detection limit. The detection limit for C2H4 is 25 pmol gdm−1 hour−1.

  • c NH4+ represents NH4(T) added as NH4Cl at a 1 mM final concentration.

  • d ATU was used at a 1 mM final concentration.