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Hoignè and Bader1 investigated the ozonation of oxalic acid/oxalate ion at various pH’s and concluded that the direct reaction can be considered negligible.

The oxidation of oxalate ion at alkaline pH’s, for example, is due to attack by free radicals generated by O3 decomposition:2

˙

˙

O3 + OH-

O3 + HO2

˙

O2

-

  • +

    HO2

˙

2O2 + OH

(1) (2)

or alternatively:

˙

2HO2

O2

  • +

    H2O2

(3)

H2O2

  • +

    O2

˙

-

OH-

˙

  • +

    OH + O2

(4)

T h e p r o d u c e d o x i d a n t s p e c i e s c a n i n d u c e t h e m i n e r a l i z a t i o n o f t h e o x a l a t e a n i o n : C 2 O 4 2 - + 2 ˙ O H 2 C O 2 + 2 (5) O H -

  • 1.

    J. Hoignè, H. Bader, Water Res. 17 (1983) 18

  • 2.

    B. Kasprzyk-Hordern, M. Ziólek, J. Nawrocki, Appl. Catal. B: Environ. 46 (2003) 639

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