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

Content Provider	Springer Nature Link
Author	Teisserenc, Roman Lucotte, Marc Houel, Stéphane
Copyright Year	2010
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.
Starting Page	235
Ending Page	244
Page Count	10
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	103
Issue Number	1-3
e-ISSN	1573515X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-05-13
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Mercury Lignin biomarker Boreal forest lakes Terrigenous organic matter Sediment Life Sciences Environmental Chemistry Ecosystems Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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