All reagents used were analytical grade. Nicotine was supplied by Sigma-Aldrich, and hydrogen peroxidewas obtainedas a 30%solution by weight from Riedel-de Haën. FeSO4 was obtained from Fluka. Solutions were acidified with sulfuric acid from Riedel de Haën when required. Milli-Q water (N18 mΩcm) purified with a deionizing system was employed as water source for solution preparation. Fenton-type reactions were carried out by adding hydrogen peroxide to an aqueous solution of nicotine. Different amounts of hydrogen peroxide (5%, 25%, 100%, and 200% of the stoichiometric dosage theoretically required for total mineralization of nicotine) were added to 100 mg/L aqueous solution of nicotine. The stoichiometric amount of H2O2 was calculated according to the following reaction: