Methyl mercury production in freshwater microcosms affected by dissolved oxygen levels : Role of cobalamin and microbial community composition
(1996) In Canadian Journal of Fisheries and Aquatic Sciences 53(7). p.1535-1545- Abstract
Radiolabelled Hg(NO(NO3)2 was added to microcosms containing water and sediment from a lake contaminated with cellulose fibres and mercury. We found that anoxic incubation resulted in methyl 203Hg concentrations in the water at least an order of magnitude higher than the levels in oxygenated incubation. This was explained by the fact that both the production and the water solubility of methyl mercury were higher under anoxic conditions than under oxic conditions. Demethylation, however, seemed to play a minor role, if any, in regulating methyl mercury concentrations. In the sediment, the level of methyl 203Hg was strongly correlated with the level of cobalamin and the levels of the... (More)
Radiolabelled Hg(NO(NO3)2 was added to microcosms containing water and sediment from a lake contaminated with cellulose fibres and mercury. We found that anoxic incubation resulted in methyl 203Hg concentrations in the water at least an order of magnitude higher than the levels in oxygenated incubation. This was explained by the fact that both the production and the water solubility of methyl mercury were higher under anoxic conditions than under oxic conditions. Demethylation, however, seemed to play a minor role, if any, in regulating methyl mercury concentrations. In the sediment, the level of methyl 203Hg was strongly correlated with the level of cobalamin and the levels of the phospholipid fatty acids i15:0 and 10Mel 6:0, the latter indicating the presence of Desulfobacter, a genus of sulphate-reducing bacteria.
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- author
- Regnell, Olof LU ; Tunlid, Anders LU ; Ewald, Göran LU and Sangfors, Olof
- organization
- publishing date
- 1996-01-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Canadian Journal of Fisheries and Aquatic Sciences
- volume
- 53
- issue
- 7
- pages
- 1535 - 1545
- publisher
- Canadian Science Publishing, NRC Research Press
- external identifiers
-
- scopus:0030303030
- ISSN
- 0706-652X
- DOI
- 10.1139/f96-086
- language
- English
- LU publication?
- yes
- id
- 684abf6f-3c6e-41d7-8e39-733496fec78f
- date added to LUP
- 2019-10-23 17:06:48
- date last changed
- 2024-04-16 22:17:18
@article{684abf6f-3c6e-41d7-8e39-733496fec78f,
abstract = {{<p>Radiolabelled Hg(NO(NO<sub>3</sub>)<sub>2</sub> was added to microcosms containing water and sediment from a lake contaminated with cellulose fibres and mercury. We found that anoxic incubation resulted in methyl <sup>203</sup>Hg concentrations in the water at least an order of magnitude higher than the levels in oxygenated incubation. This was explained by the fact that both the production and the water solubility of methyl mercury were higher under anoxic conditions than under oxic conditions. Demethylation, however, seemed to play a minor role, if any, in regulating methyl mercury concentrations. In the sediment, the level of methyl <sup>203</sup>Hg was strongly correlated with the level of cobalamin and the levels of the phospholipid fatty acids i15:0 and 10Mel 6:0, the latter indicating the presence of Desulfobacter, a genus of sulphate-reducing bacteria.</p>}},
author = {{Regnell, Olof and Tunlid, Anders and Ewald, Göran and Sangfors, Olof}},
issn = {{0706-652X}},
language = {{eng}},
month = {{01}},
number = {{7}},
pages = {{1535--1545}},
publisher = {{Canadian Science Publishing, NRC Research Press}},
series = {{Canadian Journal of Fisheries and Aquatic Sciences}},
title = {{Methyl mercury production in freshwater microcosms affected by dissolved oxygen levels : Role of cobalamin and microbial community composition}},
url = {{http://dx.doi.org/10.1139/f96-086}},
doi = {{10.1139/f96-086}},
volume = {{53}},
year = {{1996}},
}