Figure 1. Residual ozone concentrations in nano-bubble ozone water (NBOW) during storage. A: Residual ozone concentration in NBOW stored at 25˚C for 1 week. B: Residual ozone concentration in NBOW stored at 4˚C for 1 month. The experiments were repeated three (A) or five (B) times. The values are presented as the means±SD.
