The kinetics of the reaction of nitrite ion in bisulfite solutions to form hydroxylaminedisulfonate have been investigated. Evidence has been presented that nitrososulfonic acid is the probable intermediate in this reaction and that it can undergo sulfonation or hydrolysis reactions. The hydrolysis reaction yields N20 under the present conditions of study (acid solutions), which complicates the determination of the rate of formation of hydroxylaminedisulfonate. The ratio of the rate constants for sulfonation and hydrolysis (kA/kB) is 1.7 ± 0.5. The previously determined rate law for the formation of the disulfonate has been verified, although one term has been shown to be absent when phthalate, oxalate, or tartrate buffer systems are used to maintain the desired acidity.

The reaction between nitrite and bisulfite to form hydroxylamine disulfonate has been investigated and found to consist of three concurrent processes.TI1e reaction rate law can be expressed as d [HADS]

Combustion-produced soot (carbonaceous) particles have been found to be efficient catalysts for so 2 oxidation, especially in the presence of liquid water. A kinetic study of the catalytic oxidation of so 2 on carbon particles suspended in solution has been carried out. The reaction was found to be first order with respect to tlte concentration of carbon particles, 0.69th order with respect to dissolved oxygen, between zero and second order with respect to S(IV) concentrations, and independent of the pH. Temperature studies were carried out, and an activation energy for this reaction was determined. A four-step mechanism is proposed for this carbon-catalyzed oxidation reaction.

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