TEMPERATURE-DEPENDENCE OF THE RATE CONSTANTS FOR REACTIONS OF THE SULFATE RADICAL, SO4-, WITH ANIONS

Rate constants have been measured as a function of temperature over the range 10-60°C for the reactions of the sulfate radical, SO4-, with azide, chloride, cyanate, cyanide, acetate, and carbonate anions. Room-temperature rate constants ranged from about 5 × 106 to 5 × 109 M-1 s-1. The variation of the rate constant with substrate depended mainly on the Arrhenius preexponential factor and less on the activation energy. For the reaction of SO4- with Cl-, the dependence of the rate constant on ionic strength was determined to be in agreement with the theoretical prediction.