[14p-P9-1~30] 8 Plasma Electronics（Poster）

▲ [14p-P9-17] Time evolution of reactive oxygen nitrogen species in plasma-activated liquids

〇(D)Timothy Ryan Brubaker¹, Kenji Ishikawa¹, Keigo Takeda¹, Hiroshi Hashizume¹, Hiromasa Tanaka¹, Hiroko Kondo¹, Makoto Sekine¹, Masaru Hori¹ (1.Nagoya Univ.)

Keywords:plasma-activated liquid, absorption spectroscopy, essential media

This work presents time-resolved measurements of reactive oxygen and nitrogen species within plasma-activated water and diluted Dulbecco’s Modified Eagle’s Medium by a single-pass UV absorption system. Plasma-activated liquids were created using an argon-fed, non-equilibrium APP. The APP nozzle was placed 13 mm from the liquid surface and was operated using a 60-Hz AC high voltage supply while varying applied voltage and gas flow rate. Liquids were treated in a 3.5-mL SiO₂ cuvette, allowing real-time measurements by UV absorption spectroscopy.
The time-evolution of RONS such as H₂O₂, NO₂, NO₃ and HNO₂ were investigated and evaluated against known solutions and previous studies using chemical indicators. Of interest is the suggested presence of HNO₂, an unstable acid that may contribute to sustained levels of NO, NO₃^-, and H⁺ well after plasma exposure.