Mercury speciation, bioavailability, and biomagnification in contaminated streams on the Savannah River Site (SC, USA)
Abstract
Water, sediment, and biota from two streams on the Savannah River Site were sampled to study mercury (Hg) biogeochemistry. Total and methyl-Hg (MHg) concentrations were measured for all samples, speciation models were used to explore Hg speciation in the water, and Diffusive Gradients in Thin Films (DGT) were applied to indicate the vertical profiles of labile Hg (DGT-Hg). Trophic position (δ15N) was estimated for biota and used to establish MHg biomagnification model. Furthermore, the speciation model indicated Hg methylation in the water occurred on settling particles and the most bioavailable Hg species to bacteria were complexes of inorganic Hg and labile organic ligands. Correspondingly, dissolved organic carbon concentrations were positively related to MHg concentrations in the water. In the sediment, the sharp increase of DGT-Hg around the sediment water interface underscores the importance of this interface, which determines the differences in the accumulation and generation of labile Hg among different waterbodies. The positive correlation between sediment MHg and sulfate concentrations suggested possible methylation reaction by dissimilatory sulfate reducing bacteria in the sediment. The food web magnification factors of MHg were 9.6 (95% CI: 4.0 - 23.4) and 4.4 (95% 31 CI: 2.5 - 7.7) for the two streams established withmore »
- Authors:
-
- Univ. of Georgia, Aiken, SC (United States)
- Univ. of Georgia, Aiken, SC (United States); Univ. of South Florida, Tampa, FL (United States)
- Publication Date:
- Research Org.:
- Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Lab. (SREL)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Univ. of South Florida
- OSTI Identifier:
- 1819450
- Alternate Identifier(s):
- OSTI ID: 1528639
- Grant/Contract Number:
- FC09-07SR22506; EM0004391
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science of the Total Environment
- Additional Journal Information:
- Journal Volume: 668; Journal ID: ISSN 0048-9697
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Mercury; Speciation; Methylation; Bioavailability; Biomagnification; Diffusive gradients in thin films
Citation Formats
Xu, Xiaoyu, Bryan, Albert L., Mills, Gary L., and Korotasz, Alexis M. Mercury speciation, bioavailability, and biomagnification in contaminated streams on the Savannah River Site (SC, USA). United States: N. p., 2019.
Web. doi:10.1016/j.scitotenv.2019.02.301.
Xu, Xiaoyu, Bryan, Albert L., Mills, Gary L., & Korotasz, Alexis M. Mercury speciation, bioavailability, and biomagnification in contaminated streams on the Savannah River Site (SC, USA). United States. https://doi.org/10.1016/j.scitotenv.2019.02.301
Xu, Xiaoyu, Bryan, Albert L., Mills, Gary L., and Korotasz, Alexis M. Wed .
"Mercury speciation, bioavailability, and biomagnification in contaminated streams on the Savannah River Site (SC, USA)". United States. https://doi.org/10.1016/j.scitotenv.2019.02.301. https://www.osti.gov/servlets/purl/1819450.
@article{osti_1819450,
title = {Mercury speciation, bioavailability, and biomagnification in contaminated streams on the Savannah River Site (SC, USA)},
author = {Xu, Xiaoyu and Bryan, Albert L. and Mills, Gary L. and Korotasz, Alexis M.},
abstractNote = {Water, sediment, and biota from two streams on the Savannah River Site were sampled to study mercury (Hg) biogeochemistry. Total and methyl-Hg (MHg) concentrations were measured for all samples, speciation models were used to explore Hg speciation in the water, and Diffusive Gradients in Thin Films (DGT) were applied to indicate the vertical profiles of labile Hg (DGT-Hg). Trophic position (δ15N) was estimated for biota and used to establish MHg biomagnification model. Furthermore, the speciation model indicated Hg methylation in the water occurred on settling particles and the most bioavailable Hg species to bacteria were complexes of inorganic Hg and labile organic ligands. Correspondingly, dissolved organic carbon concentrations were positively related to MHg concentrations in the water. In the sediment, the sharp increase of DGT-Hg around the sediment water interface underscores the importance of this interface, which determines the differences in the accumulation and generation of labile Hg among different waterbodies. The positive correlation between sediment MHg and sulfate concentrations suggested possible methylation reaction by dissimilatory sulfate reducing bacteria in the sediment. The food web magnification factors of MHg were 9.6 (95% CI: 4.0 - 23.4) and 4.4 (95% 31 CI: 2.5 - 7.7) for the two streams established with trophic data of biofilm, invertebrates, and fish. Meanwhile, DGT-Hg concentrations in the water were positively correlated to biofilm Hg concentrations, which can be combined with the MHg biomagnification model to generate a modified biomagnification model that estimate MHg bioaccumulation with only labile Hg concentrations in the water. With this approach, Hg accumulation in abiotic and biotic environmental compartments were connected and the different bioaccumulation patterns of Hg in different waterbodies were explained with both geochemical and biological factors.},
doi = {10.1016/j.scitotenv.2019.02.301},
journal = {Science of the Total Environment},
number = ,
volume = 668,
place = {United States},
year = {Wed Feb 20 00:00:00 EST 2019},
month = {Wed Feb 20 00:00:00 EST 2019}
}
Web of Science
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