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H2O2, NO2− and NO3− concentration and pH value (insets) change in PAP. Plasma treatment of 12 min, at gas flow rates of 0.5 and 1 slm (99.8% He/0.2% O2), and treatment distances of 8 mm (a) and 20 mm (b). The data shown are the mean ± SD of 3 (a) and 2 (b) independent experiments.
