Remediation of hexavalent chromium contamination in chromite ore processing residue by sodium dithionite and sodium phosphate addition and its mechanism
TLDR
The remediation efficiency of the TSP was much higher than the corresponding OSP, and the total dissolved Cr in the leachate determined via Toxicity Characteristic Leaching Procedure (TCLP Cr) testing of samples was reduced to 3.8 mg/L.About:
This article is published in Journal of Environmental Management.The article was published on 2017-05-01 and is currently open access. It has received 50 citations till now. The article focuses on the topics: Hexavalent chromium & Sodium dithionite.read more
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A review of the formation of Cr(VI) via Cr(III) oxidation in soils and groundwater
Jialiang Liang,Xinmiao Huang,Jingwen Yan,Yunyi Li,Zhiwei Zhao,Yuanyuan Liu,Jiangyu Ye,Yunmei Wei +7 more
TL;DR: In this article, the formation of hexavalent chromium (Cr(VI) by Cr(III) oxidation in soils and groundwater is systematically reviewed, and the main oxidants of Cr(II) in soils are manganese oxides (MnOx), hydrogen peroxide (H2O2), and photochemical generated radicals.
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Reduction and immobilization of hexavalent chromium in chromite ore processing residue using amorphous FeS2.
TL;DR: FeS2(am) showed excellent efficiency for the remediation of COPR over both short- and long-term treatment trials, demonstrating it is a very promising alternative treatment method.
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Electrokinetic removal of chromium from chromite ore-processing residue using graphite particle-supported nanoscale zero-valent iron as the three-dimensional electrode
TL;DR: In this article, graphite particle-supported nanoscale zero-valent iron (GP-nZVI) synthesized by an impregnation-reduction pathway was used as a microelectrode in a three-dimensional electrochemical system to enhance the electrokinetic removal of chromium leachate from COPR samples.
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Rapid Cr(VI) reduction and immobilization in contaminated soil by mechanochemical treatment with calcium polysulfide.
TL;DR: XPS results demonstrated that Cr(VI) can be converted into Cr(III) during ball milling with CPS, which makes mechanochemical treatment a great potential in field remediation.
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Remediation of soil contaminated with high levels of hexavalent chromium by combined chemical-microbial reduction and stabilization.
TL;DR: Investigation of the use of chemical reduction combined with microbial stabilization to remediate soils contaminated with high levels of hexavalent chromium found that bacterial community changed more than fungal community during the reduction process, and the species abundance and species evenness of bacteria decreased.
References
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Sequential extraction procedure for the speciation of particulate trace metals
TL;DR: In this paper, an analytical procedure involving sequential chemicai extractions was developed for the partitioning of particulate trace metals (Cd, Co, Cu, Ni, Pb, Zn, Fe, and Mn) into five fractions: exchangeable, bound to carbonates, binding to Fe-Mn oxides and bound to organic matter.
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Chemical and microbial remediation of hexavalent chromium from contaminated soil and mining/metallurgical solid waste: a review.
TL;DR: The chemical/biological remediation processes for Cr(VI) and their efficiency have been summarised in some detail and the interaction of chromium with various microbial/bacterial strains isolated and their reduction capacity towards Cr( VI) are also discussed.
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A Critical Assessment of Chromium in the Environment
TL;DR: In this paper, the authors reviewed the emissions, environmental fate and transport, analytical chemistry, uptake and metabolism, toxicology, and human epidemiology of chromium, and found that chromium is unique among regulated toxic elements in the environment in that different species of the chromium are regulated in different ways, in contrast to other toxic elements where the oxidation state is not distinguished.
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Stoichiometry of Cr(VI) Immobilization Using Nanoscale Zerovalent Iron (nZVI): A Study with High-Resolution X-Ray Photoelectron Spectroscopy (HR-XPS)
TL;DR: In this paper, the reduction and precipitation of hexavalent chromium [Cr(VI)] by nanoscale zerovalent iron (nZVI) is evaluated.
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Chromium cycling in soils and water : links, gaps, and methods
TL;DR: The major links in the cycling of chromium in soils and in natural waters are between chromium(III) and chromium (VI).