Labbé, Normand; Parent, Serge et Villemur, Richard 
ORCID: https://orcid.org/0000-0001-9768-8937
(2003).
Addition of trace metals increases denitrification rate in closed marine systems
Water Research
, vol. 37
, nº 4.
pp. 914-920.
DOI: 10.1016/s0043-1354(02)00383-4.
Résumé
We investigated the effect of trace metals (Fe, Mn, Cu, Zn and Mo) on the denitrification unit at the Montreal Biodome. Two dosages of the five trace metals were tested on a denitrifying bacterial population which was extracted from the denitrification unit and cultured in 250 mL chemostats with artificial seawater. The low dosage showed a 20% increase in the denitrification rate whereas the high dosage had a more pronounced effect with a 250% increase. No increase in bacterial growth was observed, suggesting that the trace metals had an effect on the denitrification activity. When the trace metals were tested separately, only iron had a significant effect similar to the increase in the denitrification rate observed when the five trace metals were added. The combination of Fe and Mn caused a small but significant increase compared to the five trace metals. We then tested the effect of adding Fe, Mn and Cu to the denitrification unit at the Montreal Biodome. A high dosage of these trace metals showed a 250% increase in the denitrification rate, which went from 200 to 700g NOx-N/d. Our results showed that the addition of trace metals is crucial for denitrification activities.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | Denitrification; Seawater; Trace metals; Iron; Closed systems |
| Centre: | Centre INRS-Institut Armand Frappier |
| Date de dépôt: | 25 déc. 2024 17:25 |
| Dernière modification: | 25 déc. 2024 17:25 |
| URI: | https://espace.inrs.ca/id/eprint/14806 |
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