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Main Title: Products of Hexavalent Chromium Reduction by Green Rust Sodium Sulfate and Associated Reaction Mechanisms
Author(s): Thomas, Andrew N.
Eiche, Elisabeth
Göttlicher, Jörg
Steininger, Ralph
Benning, Liane G.
Freeman, Helen M.
Dideriksen, Knud
Neumann, Thomas
Type: Article
Language Code: en
Abstract: The efficacy of in vitro Cr(VI) reduction by green rust sulfate suggests that this mineral is potentially useful for remediation of Cr-contaminated groundwater. Previous investigations studied this reaction but did not sufficiently characterize the intermediates and end products at chromate (CrO42−) concentrations typical of contaminant plumes, hindering identification of the dominant reaction mechanisms under these conditions. In this study, batch reactions at varying chromate concentrations and suspension densities were performed and the intermediate and final products of this reaction were analyzed using X-ray absorption spectroscopy and electron microscopy. This reaction produces particles that maintain the initial hexagonal morphology of green rust but have been topotactically transformed into a poorly crystalline Fe(III) oxyhydroxysulfate and are coated by a Cr (oxy) hydroxide layer that results from chromate reduction at the surface. Recent studies of the behavior of Cr(III) (oxy) hydroxides in soils have revealed that reductive transformation of CrO42− is reversible in the presence of Mn(IV) oxides, limiting the applicability of green rust for Cr remediation in some soils. The linkage of Cr redox speciation to existing Fe and Mn biogeochemical cycles in soils implies that modification of green rust particles to produce an insoluble, Cr(III)-bearing Fe oxide product may increase the efficacy of this technique.
Issue Date: 29-Oct-2018
Date Available: 9-Sep-2019
DDC Class: 550 Geowissenschaften
540 Chemie und zugeordnete Wissenschaften
Subject(s): green rust sulfate
metal redox cycles
Sponsor/Funder: EC/H2020/675219/EU/Metal oxide Aided Subsurface Remediation: From Invention to Injection/METAL-AID
Journal Title: Soil Systems
Publisher: MDPI
Publisher Place: Basel
Volume: 2
Issue: 4
Article Number: 58
Publisher DOI: 10.3390/soilsystems2040058
EISSN: 2571-8789
Appears in Collections:FG Angewandte Geochemie » Publications

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