Abstract
The interaction mechanism between an argon plasma flow at atmospheric pressure and water surface was studied. The generation and residual of reactive oxygen species (ROS) in purified water were focused in this study. Exposure of a water surface to the plasma flow at atmospheric pressure for 10 min generated ROS in purified water. The ROS concentration increased greater than 30,000 counts/10 s with 43% of the ROS still remaining after 30min in air, whereas exposure only to the plasma emission did not affect the level of ROS in purified water. The generation of chemical species which were transported to the water surface was also clarified. The ROS in the former water had a weak bacteriostatic effect.
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