NDLI: Oxidation of Cr<sup>III</sup> to Cr<sup>VI</sup> during chlorination of drinking water

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Journal of Environmental Monitoring Vol - 14 Issue - 6

Journal of Environmental Monitoring Vol - 14 Issue - 5

Journal of Environmental Monitoring Vol - 14 Issue - 4

Journal of Environmental Monitoring Vol - 14 Issue - 3

Journal of Environmental Monitoring Vol - 14 Issue - 2

Journal of Environmental Monitoring Vol -9

Journal of Environmental Monitoring Vol -8

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Journal of Environmental Monitoring Vol -6

Journal of Environmental Monitoring Vol -5

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Journal of Environmental Monitoring Vol -3

Journal of Environmental Monitoring Vol -2

Oxidation of Cr^III to Cr^VI during chlorination of drinking water

Content Provider	Royal Society of Chemistry (RSC)
Author	Farley, Kevin J. Lindsay, Dana R. Carbonaro, Richard F.
Copyright Year	2012
Abstract	Drinking water treatment typically uses strong oxidants such as chlorine which are capable of converting CrIII to CrVI. The rates and extent of CrIII oxidation by chlorine are not well established. CrIII oxidation experiments were therefore conducted in distilled deionized water and New York City tap water dosed initially with CrIII and supplemented with sodium hypochlorite to increase free chlorine residual. Reaction progress was monitored using capillary electrophoresis which quenched reactions and allowed for quantification of CrVI. Three different forms of CrIII were used as reactants: a CrIII nitrate salt, CrIII–EDTA, and CrIII hydroxide. Rates of CrVI production for all three forms of CrIII were rapid, on the order of hours. However, oxidation rates slowed and a plateau in CrVI concentrations was reached. This resulted in less than 100% conversion of CrIII to CrVI even at relatively high chlorine doses (10 to 100 mg L−1 as Cl2). The loss of free chlorine due to a non-Cr chlorine demand, the precipitation of CrIII to Cr(OH)3(s), and the partial oxidation of CrIII to intermediate oxidation states (i.e. CrIV and CrV) were examined and eliminated as possible explanations for this behavior. Consumption of chlorine via reaction with intermediate oxidation states of Cr is therefore offered as a possible explanation for the plateau in CrVI concentrations.
Starting Page	1789
Ending Page	1797
Page Count	9
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	14
Issue Number	7
Journal	Journal of Environmental Monitoring
DOI	10.1039/c2em00012a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	New York City Chlorine Purified water Dosed Hypochlorite Capillary electrophoresis Nitrate Sodium hydroxide Plateau
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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Oxidation of CrIII to CrVI during chlorination of drinking water

Oxidation of Cr^III to Cr^VI during chlorination of drinking water