X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system

Gu, B.; Mishra, B.; Miller, C.; Wang, W.; Lai, B.; Brooks, S. C.; Kemner, K. M.; Liang, L.

doi:10.5194/bg-11-5259-2014

Title: X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system

Journal Article · Tue Sep 30 00:00:00 EDT 2014 · Biogeosciences (Online)

DOI:https://doi.org/10.5194/bg-11-5259-2014· OSTI ID:1198214

Gu, B.; Mishra, B.; Miller, C.; Wang, W.; Lai, B.; Brooks, S. C.; Kemner, K. M.; Liang, L.

Mercury (Hg) bioavailability and geochemical cycling is affected by its partitioning between the aqueous and particulate phases. We applied a synchrotron-based X-ray fluorescence (XRF) microprobe to visualize and quantify directly the spatial localization of Hg and its correlations with other elements of interest on suspended particles from a Hg-contaminated freshwater system. Up to 175 μg g⁻¹ Hg is found on suspended particles, but less than 0.01% is in the form of methylmercury. Mercury is heterogeneously distributed among phytoplankton (e.g., diatoms) and mineral particles that are rich in iron oxides and natural organic matter (NOM). The diatom-bound Hg is mostly found on outer surfaces of the cells, suggesting passive sorption of Hg on diatoms. Our results indicate that localized sorption of Hg onto suspended particles, including diatoms and NOM-coated oxide minerals, may play an important role in affecting the partitioning, reactivity, and biogeochemical cycling of Hg in natural aquatic environments.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1198214

Alternate ID(s):: OSTI ID: 1132978

Journal Information:: Biogeosciences (Online), Journal Name: Biogeosciences (Online) Vol. 11 Journal Issue: 18; ISSN 1726-4189

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 27 works

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Title: X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system

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