New Insights on Ecosystem Mercury Cycling Revealed by Stable Isotopes of Mercury in Water Flowing from a Headwater Peatland Catchment

Stable isotope compositions of mercury (Hg) were measured in the outlet stream and in soil cores at different landscape positions in a 9.7-ha boreal upland-peatland catchment. An acidic permanganate/persulfate digestion procedure was validated for water samples with high dissolved organic matter (DO...

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Bibliographic Details
Published in:Environmental science & technology 2018-02, Vol.52 (4), p.1854-1861
Main Authors: Woerndle, Glenn E, Tsz-Ki Tsui, Martin, Sebestyen, Stephen D, Blum, Joel D, Nie, Xiangping, Kolka, Randall K
Format: Article
Language:English
Subjects:
Analysis
Catchment areas
Catchments
Cores
Deposition
Dissolved organic matter
Dry deposition
Ecosystems
Fractionation
Hydrology
Isotopes
Mercury
Mercury (metal)
Peatlands
Snowmelt
Stable isotopes
Stream discharge
Stream flow
Variation
Water analysis
Water sampling
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Summary:Stable isotope compositions of mercury (Hg) were measured in the outlet stream and in soil cores at different landscape positions in a 9.7-ha boreal upland-peatland catchment. An acidic permanganate/persulfate digestion procedure was validated for water samples with high dissolved organic matter (DOM) concentrations through Hg spike addition analysis. We report a relatively large variation in mass-dependent fractionation (δ202Hg; from −2.12 to −1.32‰) and a smaller, but significant, variation of mass-independent fractionation (Δ199Hg; from −0.35 to −0.12‰) during two years of sampling with streamflow varying from 0.003 to 7.8 L s–1. Large variations in δ202Hg occurred only during low streamflow (
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.7b04449