summarized below, where the SO: and HSO: species are responsible for the net production of Co(II1) (11, 12). The reaction sequence is initiated by the rate-determining formation of the sulfite radical SO;, which can rapidly react with oxygen to produce a strong oxidizing agent SO:. COUII) + H S O ~+ cam) + SO; SO; + 0, + SO;
+ H+
SIOW
1.5x 10' M-'
