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- PMID: 16117105
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Article: Kinetics of the reduction of chromium(VI) by vitamin C
Title | Kinetics of the reduction of chromium(VI) by vitamin C |
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Authors | |
Keywords | Hexavalent chromium Reduction Trivalent chromium Vitamin C |
Issue Date | 2005 |
Publisher | Society 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/150294 |
ISSN | 2021 Impact Factor: 4.218 2020 SCImago Journal Rankings: 1.100 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Xu, XR | en_US |
dc.contributor.author | Li, HB | en_US |
dc.contributor.author | Gu, JD | en_US |
dc.contributor.author | Li, XY | en_US |
dc.date.accessioned | 2012-06-26T06:03:04Z | - |
dc.date.available | 2012-06-26T06:03:04Z | - |
dc.date.issued | 2005 | en_US |
dc.identifier.citation | Environmental Toxicology And Chemistry, 2005, v. 24 n. 6, p. 1310-1314 | en_US |
dc.identifier.issn | 0730-7268 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/150294 | - |
dc.description.abstract | The 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.language | eng | en_US |
dc.publisher | Society of Environmental Toxicology and Chemistry. The Journal's web site is located at http://etc.allenpress.com/ | en_US |
dc.relation.ispartof | Environmental Toxicology and Chemistry | en_US |
dc.subject | Hexavalent chromium | - |
dc.subject | Reduction | - |
dc.subject | Trivalent chromium | - |
dc.subject | Vitamin C | - |
dc.subject.mesh | Ascorbic Acid - Chemistry | en_US |
dc.subject.mesh | Chromium - Chemistry | en_US |
dc.subject.mesh | Hydrogen-Ion Concentration | en_US |
dc.subject.mesh | Kinetics | en_US |
dc.subject.mesh | Osmolar Concentration | en_US |
dc.subject.mesh | Oxidation-Reduction | en_US |
dc.subject.mesh | Potassium Dichromate - Chemistry | en_US |
dc.subject.mesh | Spectrophotometry, Ultraviolet | en_US |
dc.subject.mesh | Temperature | en_US |
dc.title | Kinetics of the reduction of chromium(VI) by vitamin C | en_US |
dc.type | Article | en_US |
dc.identifier.email | Gu, JD:jdgu@hkucc.hku.hk | en_US |
dc.identifier.email | Li, XY:xlia@hkucc.hku.hk | en_US |
dc.identifier.authority | Gu, JD=rp00701 | en_US |
dc.identifier.authority | Li, XY=rp00222 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1897/04-238R.1 | en_US |
dc.identifier.pmid | 16117105 | - |
dc.identifier.scopus | eid_2-s2.0-18844375092 | en_US |
dc.identifier.hkuros | 101258 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-18844375092&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 24 | en_US |
dc.identifier.issue | 6 | en_US |
dc.identifier.spage | 1310 | en_US |
dc.identifier.epage | 1314 | en_US |
dc.identifier.isi | WOS:000229140400002 | - |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Xu, XR=7405293882 | en_US |
dc.identifier.scopusauthorid | Li, HB=25649944400 | en_US |
dc.identifier.scopusauthorid | Gu, JD=7403129601 | en_US |
dc.identifier.scopusauthorid | Li, XY=26642887900 | en_US |
dc.identifier.issnl | 0730-7268 | - |