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Stability of the PAW (nitrates) during storage at 4 °C as a function of the voltage peak-to-peak during the PAW generation (20 min treatment). For the same storage time (0, 1, 7 or 14 days), bars bearing different lowercase letters are significantly different (p ≤ 0.05). For the same voltage peak-to-peak (9, 10 or 11 kV), bars bearing different uppercase letters are significantly different (p ≤ 0.05).
