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Article: Kinetics of the reduction of chromium(VI) by vitamin C

TitleKinetics of the reduction of chromium(VI) by vitamin C
Authors
KeywordsHexavalent chromium
Reduction
Trivalent chromium
Vitamin C
Issue Date2005
PublisherSociety of Environmental Toxicology and Chemistry. The Journal's web site is located at http://etc.allenpress.com/
Citation
Environmental Toxicology And Chemistry, 2005, v. 24 n. 6, p. 1310-1314 How to Cite?
AbstractThe kinetics of the reduction of Cr(VI) to Cr(III) by vitamin C was studied using potassium dichromate solution as the model pollutant. Effects of the concentration of vitamin C, pH, temperature, and irradiation on the reduction of Cr(VI) were examined. The kinetics of Cr(VI) reduction by vitamin C can be described as -d[Cr(VI)]/dt = 0.0156 (μM s-1)·[Cr(VI)] [vitamin C] (pH 5), where dt is the differential function (d) of time (t). The activation entropy (ΔS‡) and enthalpy (ΔH‡) are 42.4 kJ mol-1 and -71.0 J mol-1 K-1, respectively, and the activation energy at 298 K is 63.5 kj mol-1. The advantages of vitamin C as a reductant are as follows: It is an important biological reductant in humans and animals, and it is not toxic. Toxic Cr(VI) can be reduced by vitamin C not only in acidic conditions but also in alkaline solutions (pH 9); furthermore, the reduction was shown to occur both under the irradiation and in the dark. The present results suggest that vitamin C could be used effectively in the remediation of Cr(VI)-contaminated soil and groundwater in a wide range of pH, with or without sunlight. © 2005 SETAC.
Persistent Identifierhttp://hdl.handle.net/10722/150294
ISSN
2015 Impact Factor: 2.763
2015 SCImago Journal Rankings: 1.523
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXu, XRen_US
dc.contributor.authorLi, HBen_US
dc.contributor.authorGu, JDen_US
dc.contributor.authorLi, XYen_US
dc.date.accessioned2012-06-26T06:03:04Z-
dc.date.available2012-06-26T06:03:04Z-
dc.date.issued2005en_US
dc.identifier.citationEnvironmental Toxicology And Chemistry, 2005, v. 24 n. 6, p. 1310-1314en_US
dc.identifier.issn0730-7268en_US
dc.identifier.urihttp://hdl.handle.net/10722/150294-
dc.description.abstractThe kinetics of the reduction of Cr(VI) to Cr(III) by vitamin C was studied using potassium dichromate solution as the model pollutant. Effects of the concentration of vitamin C, pH, temperature, and irradiation on the reduction of Cr(VI) were examined. The kinetics of Cr(VI) reduction by vitamin C can be described as -d[Cr(VI)]/dt = 0.0156 (μM s-1)·[Cr(VI)] [vitamin C] (pH 5), where dt is the differential function (d) of time (t). The activation entropy (ΔS‡) and enthalpy (ΔH‡) are 42.4 kJ mol-1 and -71.0 J mol-1 K-1, respectively, and the activation energy at 298 K is 63.5 kj mol-1. The advantages of vitamin C as a reductant are as follows: It is an important biological reductant in humans and animals, and it is not toxic. Toxic Cr(VI) can be reduced by vitamin C not only in acidic conditions but also in alkaline solutions (pH 9); furthermore, the reduction was shown to occur both under the irradiation and in the dark. The present results suggest that vitamin C could be used effectively in the remediation of Cr(VI)-contaminated soil and groundwater in a wide range of pH, with or without sunlight. © 2005 SETAC.en_US
dc.languageengen_US
dc.publisherSociety of Environmental Toxicology and Chemistry. The Journal's web site is located at http://etc.allenpress.com/en_US
dc.relation.ispartofEnvironmental Toxicology and Chemistryen_US
dc.subjectHexavalent chromium-
dc.subjectReduction-
dc.subjectTrivalent chromium-
dc.subjectVitamin C-
dc.subject.meshAscorbic Acid - Chemistryen_US
dc.subject.meshChromium - Chemistryen_US
dc.subject.meshHydrogen-Ion Concentrationen_US
dc.subject.meshKineticsen_US
dc.subject.meshOsmolar Concentrationen_US
dc.subject.meshOxidation-Reductionen_US
dc.subject.meshPotassium Dichromate - Chemistryen_US
dc.subject.meshSpectrophotometry, Ultravioleten_US
dc.subject.meshTemperatureen_US
dc.titleKinetics of the reduction of chromium(VI) by vitamin Cen_US
dc.typeArticleen_US
dc.identifier.emailGu, JD:jdgu@hkucc.hku.hken_US
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_US
dc.identifier.authorityGu, JD=rp00701en_US
dc.identifier.authorityLi, XY=rp00222en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1897/04-238R.1en_US
dc.identifier.pmid16117105-
dc.identifier.scopuseid_2-s2.0-18844375092en_US
dc.identifier.hkuros101258-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-18844375092&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume24en_US
dc.identifier.issue6en_US
dc.identifier.spage1310en_US
dc.identifier.epage1314en_US
dc.identifier.isiWOS:000229140400002-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridXu, XR=7405293882en_US
dc.identifier.scopusauthoridLi, HB=25649944400en_US
dc.identifier.scopusauthoridGu, JD=7403129601en_US
dc.identifier.scopusauthoridLi, XY=26642887900en_US

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