Abstract
The reaction of ȮH radicals with thiosulphate ions in aqueous solutions leads to intermediates identified as S 2 O 3 OH 2- ( λ max = 320 nm, ϵ 320 = (0.8 ± 0.2) × 10 2 m 2 mol -1), S 4 O 6 3- ( λ max = 420 nm, ϵ 420 = (4.2 ± 0.9) × 10 2 m 2 mol -1) and S 2 O 3 ( λ max = 370 nm). The proposed mechanism, 1. (1) O ̇ H + S 2O 3 2- → S 2O 3OH 2-k 1 = (7.8 ± 2.1) × 10 9 dm 3 mol -1 s -1 2. (2) S 2 O 3 OH 2- + S 2 O 3 2- → S 4 O 6 3- + OH - k 2 = (6 ± 2) × 10 8 dm 3 mol -1 s -1 3. (3) S 4 O 6 3- → S 2 O 3 - + S 2 O 3 2- k 3 = (2.5 ± 0.3) × 10 6 s -1 4. (4) 2 S 2 O 3 - → products 2 k 4 = (1.9 ± 0.5) × 10 9 dm 3 mol -1 s -1 was checked by a mathematical simulation of the experimental transient absorbance-time profiles.
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