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dc.contributor.authorGeelhoed, Jeanine S
dc.contributor.authorMeeussen, Johannes CL
dc.contributor.authorRoe, Martin J
dc.contributor.authorHillier, Stephen
dc.contributor.authorThomas, Rhodri P
dc.contributor.authorFarmer, John G
dc.contributor.authorPaterson, Edward
dc.coverage.spatial8en
dc.date.accessioned2005-02-01T11:08:18Z
dc.date.available2005-02-01T11:08:18Z
dc.date.issued2003
dc.identifier.citationEnviron. Sci. Technol. (2003) 37(14),3206-3213en
dc.identifier.uriDOI: 10.1021/es0264798
dc.identifier.urihttp://hdl.handle.net/1842/672
dc.description.abstractChromite ore processing residue (COPR), derived from the so-called high lime processing of chromite ore, contains high levels of Cr(III) and Cr(VI) and has a pH between 11 and 12. Ferrous sulfate, which is used for remediation of Cr(VI) contamination in wastewater and soils via reduction to Cr(III) and subsequent precipitation of iron(III)/chromium- (III) hydroxide, has also been proposed for remediation of Cr(VI) in COPR. Instead, however, addition of FeSO4 to the infiltrating solution in column experiments with COPR greatly increased leaching of Cr(VI). Leached Cr(VI) increased from 3.8 to 12.3 mmol kg-1 COPR in 25 pore volumes with 20 mM FeSO4, reaching solution concentrations as high as 1.6 mM. Fe(II) was ineffective in reducing Cr(VI) to Cr(III) because it precipitated when it entered the column due to the high pH of COPR, while Cr(VI) in solution was transported away with the infiltrating solution. The large increase in leaching of Cr(VI) upon infiltration of sulfate, either as FeSO4 or Na2SO4, was caused by anion exchange of sulfate for chromate in the layered double hydroxide mineral hydrocalumite, a process for which scanning electron microscopy with energy-dispersive X-ray microanalysis provided direct evidence.en
dc.format.extent224892 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherRoyal Meterological Societyen
dc.subjectChromium Remediation or Release?en
dc.subjectIron(II) Sulfate Additionen
dc.subjectChromium (VI) Leachingen
dc.subjectColumnsen
dc.subjectChromite Oreen
dc.subjectProcessing Residueen
dc.titleChromium Remediation or Release? Effect of Iron(II) Sulfate Addition on Chromium(VI) Leaching from Columns of Chromite Ore Processing Residueen
dc.typeArticleen


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