Redox effects on release kinetics of arsenic, cadmium, cobalt, and vanadium in Wax Lake Deltaic freshwater marsh soils

Shaheen, Sabry M.; Rinklebe, Jörg; Frohne, Tina; White, John R.; DeLaune, R. D.

doi:10.1016/j.chemosphere.2015.12.043

Cited by 178 publications

(54 citation statements)

References 55 publications

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“…for the detoxification process), resulting in the production of organic As(V) species that can be scavenged by plants and organisms or bound to Fe(III) oxyhydroxides. This decrease in As mobility, subsequent to the establishment of oxidizing conditions, was previously discussed by Frohne et al (2014) and Shaheen et al (2016). The proposed mechanism was the precipitation of Fe(III)-oxyhydroxides and subsequent As binding.…”

Section: Implications For As Dynamics In Wetlandsmentioning

confidence: 58%

Highlighting the wide variability in arsenic speciation in wetlands: A new insight into the control of the behavior of arsenic

Guénet

Davranche

Vantelon

et al. 2017

Geochimica et Cosmochimica Acta

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Highlighting the wide variability in arsenic speciation in wetlands: a new insight into the control of the behavior of arsenic. Geochimica et Cosmochimica Acta, Elsevier, 2017, 203, pp.284-302 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1Highlighting the wide variability in arsenic speciation in wetlands: AbstractAlthough the behavior of Arsenic (As) under reducing conditions in periods of high water levels in wetlands is well understood and documented, there is a lack of information under oxidizing conditions when the water level decreases. In this study, we were interested in the first stage of the oxidizing period, when oxidation products are still in suspension. A soil sample from the Naizin Kervidy wetland (France) was incubated in the laboratory to produce a reduced soil solution. The reduced solution was subsequently oxidized, filtered and ultrafiltered using decreasing pore size membranes (5 µm, 3 µm, 0.2 µm, 30 kDa and 5 kDa). The distribution of As and Fe was investigated in each size fraction of the oxidized solution and their speciations were studied using XAS, HPLC and SEC-ICP-MS. Organic matter was characterized using thermally assisted hydrolysis and methylation gas chromatography-mass spectrometry (THM-GC-MS) and fluorescence spectroscopy. The majority of the As was present as As(V) but a small amount of As(III) still remained despite the advanced oxidized conditions. In the > 0.2 µm fractions, the XAS analyses showed that As was associated, in the second shell, with Fe (As-Fe = 3.35 Å) as bidentate binuclear complexes and C (As-C = 2.90 Å), suggesting the integration of As in biological objects. In the < 30 kDa fraction, As was directly bound to C (As-C = 1.96 Å) in the first shell indicating the presence of organic As species. In the second shell, an As-Fe distance of 3.35 Å was found showing that 2 part of the As was still complexed with Fe. The 0.2 µm-30 kDa fraction was a transitional fraction in terms of the Fe species and OM composition. In this fraction, organic matter exhibited a more humic character (aromatic molecules) inducing an increasing cation binding capacity. As a consequence, in this fraction and in the smallest one, As, Fe and OM seemed to form ternary complexes in which the Fe or nano-oxides in the > 30 kDa fraction and as monomer, or cluster in < 30 kDa fraction acted as a bridge. In all of the fractions, a proportion of As(V) was present as organic methylated species. These organic species might be produced by several organisms (animal or plant) via a detoxification process. They seemed to be bound to the particulate and colloidal Fe/OM phases as well as integ...

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Section: Implications For As Dynamics In Wetlandsmentioning

confidence: 58%

Highlighting the wide variability in arsenic speciation in wetlands: A new insight into the control of the behavior of arsenic

Guénet

Davranche

Vantelon

et al. 2017

Geochimica et Cosmochimica Acta

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“…In addition, the proportion of 4 in S IN was significantly higher than that in S IA during the whole incubation period. This may be attributed to the more As(V) reduction to As(III) and less decomposition of dissolved organic matters in soils under anoxic condition than that under aerobic condition [8,11].…”

Section: Effect Of Redox Conditions On As Fractions Inmentioning

confidence: 99%

“…Thus, it is essential to understand the stabilization/aging processes of As related to the change of As fractions in soils. And the stabilization/aging processes of As in soils not only depended on the properties of amendments but also were affected by some environmental conditions, such as temperature and redox conditions [5,[8][9][10]. For instance, the crystallization of Fe (hydr)oxides and the diffusion of As in micropores from the outer layers into the inner complex are accelerated after the temperature elevated, resulting in the transformation of labile fractions of As into unlabile fractions [5,9].…”

Section: Introductionmentioning

confidence: 99%

Impact of Redox Condition on Fractionation and Bioaccessibility of Arsenic in Arsenic-Contaminated Soils Remediated by Iron Amendments: A Long-Term Experiment

et al. 2018

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Iron-bearing amendments, such as iron grit, are proved to be effective amendments for the remediation of arsenic-(As-) contaminated soils. In present study, the effect of redox condition on As fractions in As-contaminated soils remediated by iron grit was investigated, and the bioaccessibility of As in soils under anoxic condition was evaluated. Results showed that the labile fractions of As in soils decreased significantly after the addition of iron grit, while the unlabile fractions of As increased rapidly, and the bioaccessibility of As was negligible after 180 d incubation. More labile fractions of As in iron-amended soils were transformed into less mobilizable or unlabile fractions with the contact time. Correspondingly, the bioaccessibility of As in iron-amended soils under the aerobic condition was lower than that under the anoxic condition after 180 d incubation. The redistribution of loosely adsorbed fraction of As in soils occurred under the anoxic condition, which is likely ascribed to the reduction of As(V) to As(III) and the reductive dissolution of Fe-(hydr)oxides. The stabilization processes of As in iron-amended soils under the anoxic and aerobic conditions were characterized by two stages. The increase of crystallization of Fe oxides, decomposition of organic matter, molecular diffusion, and the occlusion within Fe-(hydr)oxides cocontrolled the transformation of As fractions and the stabilization process of As in iron-amended soils under different redox conditions. In terms of As bioaccessibility, the stabilization process of As in iron-amended soils was shortened under the aerobic condition in comparison with the anoxic condition.

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“…The distribution of PTMs including Cr and Pb between the liquid and solid phase of floodplain soils and their release dynamics is mainly affected by soil properties and by changes of redox potential (E H ), soil pH, and metal carriers such as iron (Fe), manganese (Mn), dissolved organic carbon (DOC), and sulfate (SO 4 2À ) (Rinklebe et al, 2016a,b;Rupp et al, 2010;Schulz-Zunkel et al, 2015;Shaheen et al, 2013;Shaheen et al, 2014aShaheen et al, , 2016. A proper understanding of the geochemistry of Cr and Pb in floodplain soils is limited particularly under dynamic reducing-oxidizing conditions.…”

Section: Introductionmentioning

confidence: 99%

Exploiting biogeochemical and spectroscopic techniques to assess the geochemical distribution and release dynamics of chromium and lead in a contaminated floodplain soil

et al. 2016

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Redox effects on release kinetics of arsenic, cadmium, cobalt, and vanadium in Wax Lake Deltaic freshwater marsh soils

Cited by 178 publications

References 55 publications

Highlighting the wide variability in arsenic speciation in wetlands: A new insight into the control of the behavior of arsenic

Highlighting the wide variability in arsenic speciation in wetlands: A new insight into the control of the behavior of arsenic

Impact of Redox Condition on Fractionation and Bioaccessibility of Arsenic in Arsenic-Contaminated Soils Remediated by Iron Amendments: A Long-Term Experiment

Exploiting biogeochemical and spectroscopic techniques to assess the geochemical distribution and release dynamics of chromium and lead in a contaminated floodplain soil

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