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4. Results and discussion
The activity profiles of electromigration experiments are shown on Fig. 3. After 18 h of migration (experiment EM_SeO4/1), a typical Gaussian diffusive profile is observed towards the anode, which confirms our hypothesis. However, some activity remains at the source position. If the oxidation occurred in presence of NaOH, the relative amount of immobile species was even more pronounced (see Fig. 3,experimentEM_SeO4/3, and Table 2). Apparently, the efficiency of H2O2 to oxidize selenite to selenate is lower at high pH. Following Yllera de Llano et al. (1996), the optimal conditions for the oxidation of selenite to selenate by H2O2 are met at neutral pH, and by bubbling O2 through the solution.

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