X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1198214
- Alternate Identifier(s):
- OSTI ID: 1132978
- Grant/Contract Number:
- AC02-06CH11357; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Biogeosciences (Online)
- Additional Journal Information:
- Journal Name: Biogeosciences (Online) Journal Volume: 11 Journal Issue: 18; Journal ID: ISSN 1726-4189
- Publisher:
- Copernicus Publications, EGU
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Mercury; Diatom; mineral; particulates; X-ray
Citation Formats
Gu, B., Mishra, B., Miller, C., Wang, W., Lai, B., Brooks, S. C., Kemner, K. M., and Liang, L. X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system. Germany: N. p., 2014.
Web. doi:10.5194/bg-11-5259-2014.
Gu, B., Mishra, B., Miller, C., Wang, W., Lai, B., Brooks, S. C., Kemner, K. M., & Liang, L. X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system. Germany. https://doi.org/10.5194/bg-11-5259-2014
Gu, B., Mishra, B., Miller, C., Wang, W., Lai, B., Brooks, S. C., Kemner, K. M., and Liang, L. Tue .
"X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system". Germany. https://doi.org/10.5194/bg-11-5259-2014.
@article{osti_1198214,
title = {X-ray fluorescence mapping of mercury on suspended mineral particles and diatoms in a contaminated freshwater system},
author = {Gu, B. and Mishra, B. and Miller, C. and Wang, W. and Lai, B. and Brooks, S. C. and Kemner, K. M. and Liang, L.},
abstractNote = {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.},
doi = {10.5194/bg-11-5259-2014},
journal = {Biogeosciences (Online)},
number = 18,
volume = 11,
place = {Germany},
year = {Tue Sep 30 00:00:00 EDT 2014},
month = {Tue Sep 30 00:00:00 EDT 2014}
}
https://doi.org/10.5194/bg-11-5259-2014
Web of Science
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