Sulfide Inhibition of Nitrate Removal in Coastal Sediments
Tóm tắt
Microbial nitrate (NO
3
−
) removal via denitrification (DNF) at high sulfide (H2S) concentrations was compared in sediment from a coastal freshwater pond in a developed area that receives salt-water influx during storm events, and a saline pond proximal to an undeveloped estuary. Sediments were incubated with added SO
4
2−
(1,000 µg per gram dry weight basis (gdw)) to determine whether acid volatile sulfides (AVS) were formed. DNF in the sediments was measured with NO3–N (300 µg gdw−1) alone, and with NO3–N and H2S (1,000 µg S2− gdw−1). SO
4
2−
addition to the freshwater sediments resulted in AVS formation (970 ± 307 µg S gdw−1) similar to the wetland with no added SO
4
2−
(986 ± 156 µg S gdw−1). DNF rates measured with no added H2S were greater in the freshwater than the wetland site (10.6 ± 0.6 vs. 6.4 ± 0.1 µg N2O–N gdw−1 h−1, respectively). High H2S concentrations retained NH4–N in the undeveloped wetland and retained NO3–N in the developed freshwater site, suggesting that potential salt-water influx may reduce the ability of the freshwater sediments to remove NO3–N.
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