Abstract
Seven kinds of soil particles (3 mg) were dispersed in 20 ml of NaHSO3 (1 mmoll-1) solution and photoirradiated to investigate their effects on the photooxidation of S (IV). All seven soil particles catalyzed S (IV) oxidation without light. With photoirradiation, six soil particles accelerated the oxidation with oxidation rate ranging from 0.5-2.3×10-5 moll-1 min-1, compared to 0.3-1.5×10-5 moll-1 min-1 without photoirradiation. Fe concentration increased during the oxidation of S (IV).
