The CPs used were obtained from Sigma with a purity of 99% and were used without
further purification. Ozone was produced from a bottled oxygen stream in a laboratory
ozone generator (Yemar, mod. HPA). The water for solutions was obtained from a Millipore
Milli-Q water system. All the solutions were buffered, adjusting the pH at the selected value
by adding orthophosphoric acid and di-potassium hydrogen phosphate, so that the total ionic
strength in the final solution was always 0.05 M