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Title: Cycling of oxyanion-forming trace elements in groundwaters from a freshwater deltaic marsh

Abstract

For this study, pore waters and surface waters were collected from a freshwater system in southeastern Louisiana to investigate the geochemical cycling of oxyanion-forming trace elements (i.e., Mo, W, As, V). A small bayou (Bayou Fortier) receives input from a connecting lake (Lac des Allemands) and groundwater input at the head approximately 5 km directly south of the Mississippi River. Marsh groundwaters exchange with bayou surface water but are otherwise relatively isolated from outside hydrologic forcings, such as tides, storms, and effects from local navigation canals. Rather, redox processes in the marsh groundwaters appear to drive changes in trace element concentrations. Elevated dissolved S(-II) concentrations in marsh groundwaters suggest greater reducing conditions in the late fall and winter as compared to the spring and late summer. The data suggest that reducing conditions in marsh groundwaters initiate the dissolution of Fe(III)/Mn(IV) oxide/hydroxide minerals, which releases adsorbed and/or co-precipitated trace elements into solution. Once in solution, the fate of these elements is determined by complexation with aqueous species and precipitation with iron sulfide minerals. The trace elements remain soluble in the presence of Fe(III)- and SO 42 -- reducing conditions, suggesting that either kinetic limitations or complexation with aqueous ligands obfuscates themore » correlation between V and Mo sequestration in sediments with reducing or euxinic conditions.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [3];  [5]
  1. Tulane Univ., New Orleans, LA (United States). Dept. of Earth and Environmental Sciences; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Tulane Univ., New Orleans, LA (United States). Dept. of Earth and Environmental Sciences; Louisiana Universities Marine Consortium (LUMCON), Chauvin, LA (United States)
  3. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Marine Sciences
  4. Louisiana Universities Marine Consortium (LUMCON), Chauvin, LA (United States)
  5. Tulane Univ., New Orleans, LA (United States). Dept. of Earth and Environmental Sciences
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1463484
Report Number(s):
LA-UR-17-29259
Journal ID: ISSN 0272-7714
Grant/Contract Number:  
AC52-06NA25396; EAR-1141692; EAR-1141716; EAR-1141685
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Estuarine Coastal and Shelf Science
Additional Journal Information:
Journal Volume: 204; Journal Issue: C; Journal ID: ISSN 0272-7714
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES

Citation Formats

Telfeyan, Katherine, Breaux, Alexander, Kim, Jihyuk, Kolker, Alexander S., Cable, Jaye E., and Johannesson, Karen H.. Cycling of oxyanion-forming trace elements in groundwaters from a freshwater deltaic marsh. United States: N. p., 2018. Web. doi:10.1016/j.ecss.2018.02.024.
Telfeyan, Katherine, Breaux, Alexander, Kim, Jihyuk, Kolker, Alexander S., Cable, Jaye E., & Johannesson, Karen H.. Cycling of oxyanion-forming trace elements in groundwaters from a freshwater deltaic marsh. United States. doi:10.1016/j.ecss.2018.02.024.
Telfeyan, Katherine, Breaux, Alexander, Kim, Jihyuk, Kolker, Alexander S., Cable, Jaye E., and Johannesson, Karen H.. Fri . "Cycling of oxyanion-forming trace elements in groundwaters from a freshwater deltaic marsh". United States. doi:10.1016/j.ecss.2018.02.024. https://www.osti.gov/servlets/purl/1463484.
@article{osti_1463484,
title = {Cycling of oxyanion-forming trace elements in groundwaters from a freshwater deltaic marsh},
author = {Telfeyan, Katherine and Breaux, Alexander and Kim, Jihyuk and Kolker, Alexander S. and Cable, Jaye E. and Johannesson, Karen H.},
abstractNote = {For this study, pore waters and surface waters were collected from a freshwater system in southeastern Louisiana to investigate the geochemical cycling of oxyanion-forming trace elements (i.e., Mo, W, As, V). A small bayou (Bayou Fortier) receives input from a connecting lake (Lac des Allemands) and groundwater input at the head approximately 5 km directly south of the Mississippi River. Marsh groundwaters exchange with bayou surface water but are otherwise relatively isolated from outside hydrologic forcings, such as tides, storms, and effects from local navigation canals. Rather, redox processes in the marsh groundwaters appear to drive changes in trace element concentrations. Elevated dissolved S(-II) concentrations in marsh groundwaters suggest greater reducing conditions in the late fall and winter as compared to the spring and late summer. The data suggest that reducing conditions in marsh groundwaters initiate the dissolution of Fe(III)/Mn(IV) oxide/hydroxide minerals, which releases adsorbed and/or co-precipitated trace elements into solution. Once in solution, the fate of these elements is determined by complexation with aqueous species and precipitation with iron sulfide minerals. The trace elements remain soluble in the presence of Fe(III)- and SO42-- reducing conditions, suggesting that either kinetic limitations or complexation with aqueous ligands obfuscates the correlation between V and Mo sequestration in sediments with reducing or euxinic conditions.},
doi = {10.1016/j.ecss.2018.02.024},
journal = {Estuarine Coastal and Shelf Science},
issn = {0272-7714},
number = C,
volume = 204,
place = {United States},
year = {2018},
month = {3}
}

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