Coupled Effects of Hydrodynamics and Biogeochemistry on Zn Mobility and Speciation in Highly Contaminated Sediments

Porewater transport and diagenetic reactions strongly regulate the mobility of metals in sediments. We executed a series of laboratory experiments in Gust chamber mesocosms to study the effects of hydrodynamics and biogeochemical transformations on the mobility and speciation of Zn in contaminated s...

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Veröffentlicht in:	Environ. Sci. Technol 2015-05, Vol.49 (9), p.5346-5353
Hauptverfasser:	Xie, Minwei, Jarrett, Brooke A, Da Silva-Cadoux, Cécile, Fetters, Kyle J, Burton, G. Allen, Gaillard, Jean-François, Packman, Aaron I
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Sprache:	eng
Schlagworte:	Acids - chemistry Aqueous solutions Biogeochemistry Contaminated sediments Fluid mechanics Geologic Sediments - chemistry Hydrodynamics Illinois Metals Porosity Spectrometry, X-Ray Emission Sulfides - analysis Volatilization Water Pollutants, Chemical - analysis Zinc Zinc - analysis Zinc - isolation & purification
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container_title	Environ. Sci. Technol
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creator	Xie, Minwei Jarrett, Brooke A Da Silva-Cadoux, Cécile Fetters, Kyle J Burton, G. Allen Gaillard, Jean-François Packman, Aaron I
description	Porewater transport and diagenetic reactions strongly regulate the mobility of metals in sediments. We executed a series of laboratory experiments in Gust chamber mesocosms to study the effects of hydrodynamics and biogeochemical transformations on the mobility and speciation of Zn in contaminated sediments from Lake DePue, IL. X-ray absorption spectroscopy (XAS) indicated that the oxidation of surficial sediments promoted the formation of more mobile Zn species. Bulk chemical measurements of porewater, overlying water, and sediment also suggested that this process liberated aqueous metals to porewater and facilitated Zn efflux to the overlying water. In addition, sediment resuspension events increased the release of aqueous metals to both surficial porewater and the overlying water column. XAS analysis indicated that resuspension increased dissolution of Zn-sequestering mineral phases. These results show that both steady slow porewater transport and rapid episodic resuspension are important to the release of metal from fine-grained, low-permeability contaminated sediments. Thus, information on metals speciation and mobility under time-varying overlying flow conditions is essential to understanding the long-term behavior of metals in contaminated sediments.
doi_str_mv	10.1021/acs.est.5b00416
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In addition, sediment resuspension events increased the release of aqueous metals to both surficial porewater and the overlying water column. XAS analysis indicated that resuspension increased dissolution of Zn-sequestering mineral phases. These results show that both steady slow porewater transport and rapid episodic resuspension are important to the release of metal from fine-grained, low-permeability contaminated sediments. 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Bulk chemical measurements of porewater, overlying water, and sediment also suggested that this process liberated aqueous metals to porewater and facilitated Zn efflux to the overlying water. In addition, sediment resuspension events increased the release of aqueous metals to both surficial porewater and the overlying water column. XAS analysis indicated that resuspension increased dissolution of Zn-sequestering mineral phases. These results show that both steady slow porewater transport and rapid episodic resuspension are important to the release of metal from fine-grained, low-permeability contaminated sediments. 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subjects	Acids - chemistry Aqueous solutions Biogeochemistry Contaminated sediments Fluid mechanics Geologic Sediments - chemistry Hydrodynamics Illinois Metals Porosity Spectrometry, X-Ray Emission Sulfides - analysis Volatilization Water Pollutants, Chemical - analysis Zinc Zinc - analysis Zinc - isolation & purification
title	Coupled Effects of Hydrodynamics and Biogeochemistry on Zn Mobility and Speciation in Highly Contaminated Sediments
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