The kinetics of some redox reactions involving Cr (VI)

Smith, Rosamund Moira

(1966)

Smith, Rosamund Moira (1966) The kinetics of some redox reactions involving Cr (VI).

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Abstract

The investigations described in this thesis involve the study of two redox reactions of Cr(VI). The reductants being As (III) and SCN respectively.The results are presented in two sections, each of which commences with a review of previous work conducted in that particular field. Two procedures found to be satisfactory for following the reactions of Cr(VI), were a spectrophotometric method involving the observation of the change of absorbance due to HCrO4 at 28,300 cm, and a radiochemical method using Cr as a tracer. The order of the reaction with respect to the various reactants was determined, and from the effects on the reaction rates caused by variations in ionic strength, specific ions present, and solvent medium, an insight into the mechanisms of the reactions was obtained. Activation energies were calculated from observations of the effect of change of temperature on the reaction rate constants. A rate equation and mechanism are postulated for the reaction of Cr(VI) with As(III) in the pH range 1.3 to 4.0. The rate equation is shown to be in better agreement with experimental data than others previously proposed.For the reaction of Cr(VI) with SCN a two term rate equation is postulated, which fits the experimental results. The intermediates of this reaction have proved difficult to identify, so two possible reaction paths have been suggested involving different intermediates.

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This is a Accepted version
This version's date is: 1966
This item is not peer reviewed

Link to this Version

https://repository.royalholloway.ac.uk/items/050fc5a6-7072-4328-87ce-32ddd173d8e1/1/

Item TypeThesis (Doctoral)
TitleThe kinetics of some redox reactions involving Cr (VI)
AuthorsSmith, Rosamund Moira
Uncontrolled KeywordsInorganic Chemistry; Pure Sciences; Chromium; Cr; Chromium; Involving; Kinetics; Reactions; Redox; Some; Vi
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Identifiers

ISBN978-1-339-62185-2

Deposited by () on 31-Jan-2017 in Royal Holloway Research Online.Last modified on 31-Jan-2017

Notes

Digitised in partnership with ProQuest, 2015-2016. Institution: University of London, Bedford College (United Kingdom).


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