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

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00173a006· OSTI ID:6774024

Conklin, M H; Hoffmann, M R

Stability constants for the formation of Fe(III)-S(IV) complexes at ..mu.. = 0.4 M were determined spectroscopically. Values of K/sub 1/ = 10/sup 6.6/ M/sup -1/ for Fe/sup 3 +/ + SO/sub 3//sup 2 -/ in equilibrium FeSO/sub 3//sup +/ and K/sub 4/ = 10/sup 7.3/ M/sup -1/ for FeOH/sup 2 +/ + SO/sub 3//sup 2 -/ in equilibrium HOFeSO/sub 3//sup 0/ 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.

• Research Organization: California Institute of Technology, Pasadena (USA)
• OSTI ID: 6774024
• Journal Information: Environ. Sci. Technol.; (United States), Vol. 22:8
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
IRON
THERMODYNAMICS
SULFUR
CHEMICAL REACTION KINETICS
COMPLEXES
ELECTRON TRANSFER
RAMAN SPECTRA
ELEMENTS
KINETICS
METALS
NONMETALS
REACTION KINETICS
SPECTRA
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties