Mixed nitrate and metal contamination influences operational speciation of toxic and essential elements.

Autor: Thorgersen MP; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, USA. Electronic address: mthorger@uga.edu., Goff JL; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, USA. Electronic address: JLGoff@uga.edu., Poole FL 2nd; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, USA. Electronic address: fpoole@uga.edu., Walker KF; Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA. Electronic address: kfwalker@lbl.gov., Putt AD; Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA. Electronic address: aputt@lbl.gov., Lui LM; Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA. Electronic address: lmlui@lbl.gov., Hazen TC; Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA; BioSciences Division, Oak Ridge National Lab, Oak Ridge, TN, USA; Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN, USA. Electronic address: tchazen@utk.edu., Arkin AP; Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Department of Bioengineering, University of California at Berkeley, Berkeley, CA, USA. Electronic address: APArkin@lbl.gov., Adams MWW; Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, USA. Electronic address: adamsm@uga.edu.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2023 Dec 01; Vol. 338, pp. 122674. Date of Electronic Publication: 2023 Oct 02.
DOI: 10.1016/j.envpol.2023.122674
Abstrakt: Environmental contamination constrains microbial communities impacting diversity and total metabolic activity. The former S-3 Ponds contamination site at Oak Ridge Reservation (ORR), TN, has elevated concentrations of nitric acid and multiple metals from decades of processing nuclear material. To determine the nature of the metal contamination in the sediment, a three-step sequential chemical extraction (BCR) was performed on sediment segments from a core located upgradient (EB271, non-contaminated) and one downgradient (EB106, contaminated) of the S-3 Ponds. The resulting exchangeable, reducing, and oxidizing fractions were analyzed for 18 different elements. Comparison of the two cores revealed changes in operational speciation for several elements caused by the contamination. Those present from the S-3 Ponds, including Al, U, Co, Cu, Ni, and Cd, were not only elevated in concentration in the EB106 core but were also operationally more available with increased mobility in the acidic environment. Other elements, including Mg, Ca, P, V, As, and Mo, were less operationally available in EB106 having decreased concentrations in the exchangeable fraction. The bioavailability of essential macro nutrients Mg, Ca, and P from the two types of sediment was determined using three metal-tolerant bacteria previously isolated from ORR. Mg and Ca were available from both sediments for all three strains; however, P was not bioavailable from either sediment for any strain. The decreased operational speciation of P in contaminated ORR sediment may increase the dependence of the microbial community on other pools of P or select for microorganisms with increased P scavenging capabilities. Hence, the microbial community at the former S-3 Ponds contamination site may be constrained not only by increased toxic metal concentrations but also by the availability of essential elements, including P.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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