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Metal ion-sulfur(IV) chemistry. 3. Thermodynamics and kinetics of transient iron(III)-sulfur(IV) complexes

Conklin, Martha H. and Hoffmann, Michael R. (1988) Metal ion-sulfur(IV) chemistry. 3. Thermodynamics and kinetics of transient iron(III)-sulfur(IV) complexes. Environmental Science and Technology, 22 (8). pp. 899-907. ISSN 0013-936X. http://resolver.caltech.edu/CaltechAUTHORS:20150814-140636362

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Abstract

Stability constants for the formation of Fe(III)-S(IV) complexes at µ = 0.4 M were determined spectroscopically. Values of K_1 = 10^(6.6) M^(-1) for Fe^(3+) + SO_3^(2-) ⇌ FeSO_3^+ and K_4 = 10^(7.3) M^(-1) for FeOH^(2+) + SO_3^(2-) ⇌ HOFeSO_3 were obtained. Raman measurements indicate that sulfite binds to the metal through oxygen. The kinetics of electron transfer between Fe(III) and S(IV) have been studied, and a mechanism is proposed. Kinetic and mechanistic aspects of the Fe(III)-catalyzed autoxidation of S(IV) are discussed in light of these results.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es00173a006DOIArticle
http://pubs.acs.org/doi/abs/10.1021/es00173a006PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 1988 American Chemical Society. Received for review May 1, 1987. Accepted January 6, 1988. We are indebted to Eric C. Betterton (Caltech) for his expert assistance throughout the latter stages of this work. We also acknowledge the personal support of our program officers D. Alan. Hanson (EPRI) and L. Swaby (EPA).
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Electric Power Research Institute (EPRI)UNSPECIFIED
Environmental Protection Agency (EPA)UNSPECIFIED
Record Number:CaltechAUTHORS:20150814-140636362
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150814-140636362
Official Citation:Metal ion-sulfur(IV) chemistry. 3. Thermodynamics and kinetics of transient iron(III)-sulfur(IV) complexes Martha H. Conklin and Michael R. Hoffmann Environmental Science & Technology 1988 22 (8), 899-907 DOI: 10.1021/es00173a006
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ID Code:59551
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:17 Aug 2015 17:34
Last Modified:17 Aug 2015 17:34

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