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Figure 1. The formation of hydrogen peroxide from sodium perborate (Eq. 1) (Hägg, 1969) and from carbamide peroxide (Eq. 2) (Budavari et al., 1989). Hydrogen peroxide forms free radicals like hydroxyl and perhydroxyl radicals, and superoxide anions (Eq. 3a) (Gregus and Klaassen, 1995), reactive oxygen molecules that are unstable and transformed to oxygen (Eq. 3b) (Cotton and Wilkinson, 1972), and hydrogen peroxide anions (Eq. 3c) (Cotton and Wilkinson, 1972).
