title: Kinetics of the Benzaldehyde-Inhibited Oxidation of Sulfite by Chlorine Dioxide.
abstract: There has been steady interest in the aqueous reaction of ClO2• with sulfur(IV) since the 1950s, and a wide variety of rate laws and mechanisms have been proposed. In neutral-to-alkaline media, the reaction is challenging to study because of its great rate. Here it is shown that benzaldehyde can be used as an additive to slow the reaction and make its rates more amenable to study. The rates can be quantitatively modeled by a mechanism that includes reversible binding of sulfur(IV) by benzaldehyde and a rate-limiting mixed second-order reaction of ClO2• with SO3(2-). The latter reaction occurs through parallel electron transfer from SO3(2-) to ClO2• and oxygen-atom transfer from ClO2• to SO3(2-).
authors.affiliation: College of Chemical Engineering, China University of Mining and Technology , Xuzhou 221116, People's Republic of China.
authors.forename: Changwei
authors.initials: C
authors.lastname: Pan
authors.affiliation: College of Chemical Engineering, China University of Mining and Technology , Xuzhou 221116, People's Republic of China.
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Department of Chemistry and Biochemistry, Auburn University , Auburn, Alabama 36849 United States.
authors.forename: David M
authors.initials: DM
authors.lastname: Stanbury