Particle oxidation model of synthetic FeS and sediment acid-volatile sulfide
- Manhattan Coll., New York, NY (United States). Environmental Engineering Dept.
- CKY Inc., Oak Ridge, TN (United States)
A model is proposed for the kinetics of the oxidation of acid-volatile sulfide (AVS). It is based on a surface oxidation reaction that erodes the particle surface until the particle disappears. A monodisperse particle size distribution is assumed with a reaction rate that is proportional to the surface area remaining and a dimensional exponent that related the surface area to the particle volume. The model is fit to time course data from a number of experiments conducted using synthetic FeS at various pHs, oxygen concentrations, and ionic strengths. The reaction rate constants are modeled using a surface complexation model. It is based upon the formation of two activated surface complexes with molecular oxygen, one of which is charged. The complexation model provides a good fit to the variation of the reaction rate constant with respect to O{sub 2}, pH, temperature, and ionic strength. The dimensional exponent {nu} increases with pH from values characteristic of plates and needles to values reflecting more spherical particles, presumably due to coagulation. However the increase in {nu} with respect to O{sub 2} at high concentrations is unexplained.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 483688
- Journal Information:
- Environmental Toxicology and Chemistry, Vol. 15, Issue 12; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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