Kinetics of chromate reduction by ferrous iron
Article Abstract:
A stopped-flow kinetic approach monitored by UV-VIS spectrophotometry was applied to determine the rate constant and the rate dependence of each reactant in the removal of chromate Cr(VI) from suboxic and anoxic waters and soils. These kinetic information are necessary in determining the rate of Cr(VI) reduction and to investigate the role of oxygen in limiting such reaction. The rate of Cr(VI) removal and that for the oxygenation of Fe(II) indicate that Cr(VI) reduction should not be influenced at all by oxygen, except at pH values exceeding 8 even at micromolar concentrations.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Comment on "redox interactions of Cr(VI) and substituted phenols: products and mechanism."
Article Abstract:
No adduct formation between the reactants, as initial step to the overall reaction of Cr(VI) to substituted phenols, is seen when the reported detailed kinetic study of the oxidation reactions of phenols by Cr(VI). The absorbance maximum at -397 nm reported is unreliable due to the actual experimental design. The absorbance maximum reported at 397 nm was not realized and the difference spectra did not follow the expected trend as function of phenol concentration.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Nonmetal redox kinetics: mono-, di- and trichloramine reactions with cyanide ion
Article Abstract:
The reaction of mono-, di- and trichloramine with cyanide ions and with other nucleophiles was studied to determine the kinetics behind the formation of cyanogen chloride. The reactions were monitored by means of a spectrophotometer and a digital pH meter. Results show that cyanogen chloride is the product of a direct reaction between NH2Cl and cyanide. The acidity of NH2Cl during the reaction was also found to be dependent on acid assistance and HCN formation.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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