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Terrestrial organic matter biomarkers as tracers of Hg sources in lake sediments

Teisserenc, Roman and Lucotte, Marc and Houel, Stéphane Terrestrial organic matter biomarkers as tracers of Hg sources in lake sediments. (2010) Biogeochemistry, vol. 103 (n°1-3). pp. 235-244. ISSN 0168-2563

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Official URL: http://dx.doi.org/10.1007/s10533-010-9458-x

Abstract

Terrestrial organic matter (TOM) plays a key role in mercury (Hg) dynamics between watersheds and lakes. In this study we attempts to determine the role of TOM source and quality and not only quantity, in the fate and transport of total Hg (T-Hg) to boreal lakes. Integrating the watershed complexity is a daunting task. Within the scope of this project, we characterized this organic matter at a molecular level in order to determine Hg transfer conditions to the sediments. We sampled ten lakes in the Quebec boreal forest. In each lake, we took a sediment core at the deepest point in addition to analyzing T-Hg and a set of terrigenous biomarkers in recent sediments. Our results show no relationship between TOM quantity and T-Hg concentration in lake sediments. However, [T-Hg] variation is well explained by the increase of 3,5Bd/V ratios (R2 = 0.84; p\0.0002) and the decrease of C/V ratios (R2 = 0.5; p\0.0227). Our study shows that TOM source and quality are determinant for Hg loadings in lake sediments. More precisely, increasing TOM derived from humified soil horizons explains most of Hg level variation within sediments.

Item Type:Article
Additional Information: Thanks to Springer editor. The definitive version is available at http://www.springerlink.com/content/gm18107m647m1613/about/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Concordia University (CANADA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Institut National de la Recherche Scientifique - INRS (CANADA)
Other partners > Université de Montréal - UdeM (CANADA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université du Québec à Montréal - UQAM (CANADA)
Other partners > Collaborative Mercury Research Network - COMERN (CANADA)
Other partners > University of Colorado at Boulder - UCB (USA)
Other partners > Université McGill (CANADA)
Other partners > Université de Laval (CANADA)
Other partners > Université du Québec à Chicoutimi - UQAC (CANADA)
Other partners > Université du Québec à Rimouski - UQAR (CANADA)
Laboratory name:
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Deposited By:Nadia Kelmouss

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