Attenuation of Barium, Strontium, Cobalt, and Nickel Plumes Formed during Microbial Iron Reduction in a Crude-Oil-Contaminated Aquifer
نویسندگان
چکیده
We assessed the spatial distribution of 35 elements in aquifer sediments and groundwater a crude-oil-contaminated show evidence dissolution barium (Ba), strontium (Sr), cobalt (Co), nickel (Ni) during hydrocarbon oxidation coupled to historic microbial Fe(III)-reduction near oil. Trace element plumes occur aquifer, where 50% Co, 47% Ni, 24% Ba, 15% Sr have been mobilized from sediment oil into groundwater, resulting dissolved masses >33, 18, three, two times greater than estimated prior contamination, respectively. Ba2+ Ni2+ concentrations exceeded World Health Organization’s drinking-water guidelines 700 20 μg/L, Sediments attenuate trace geochemically distinct zones, <0.01% total despite substantial mobilization body. Geochemical modeling modern Fe(III)-reducing zone suggests are likely attenuated via coprecipitation with/without sorption on iron carbonate precipitates. In suboxic transition at leading edge plume, Fe(III)-hydroxides sorb Ba2+, Sr2+, Co2+, Ni2+. This study emphasizes that slow but persistent biogeochemical activity can substantially alter chemistry over decadal timeframes, phenomenon we term gradualism.
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ژورنال
عنوان ژورنال: ACS earth and space chemistry
سال: 2023
ISSN: ['2472-3452']
DOI: https://doi.org/10.1021/acsearthspacechem.2c00387