[16p-P4-1~16] 8.6 Plasma life sciences

△ [16p-P4-11] In-situ Analysis of Plasma Activated Water by UV Absorption Spectroscopy - Dependency on Irradiation Distance -

〇Kotaro Ogawa¹, Jun-seok Oh², Hiroshi Furuta^1,3, Akimitsu Hatta^1,3 (1.Kochi Univ. Technol., 2.Meijo Univ., 3.Center for Nanotecnology, Kochi Univ. Technol.)

Keywords:plasma

Densities of reactive species in plasma activated water irradiated to He APPJ have been quantitatively measured using UV absorption spectroscopy. In-situ measurements were carried out for DI water in a quartz cuvette set on the sample holder of a spectrophotometer with irradiation to plasma. By comparison to reference spectra for chemical agents, total amount of H2O2, NO₂^-, NO₃^- production was evaluated with variation of distance from plasma. As the results, H2O2 was maximum when the plasma was attached on water surface and both NO₂^- and NO₃^- were maximum when the distance was about 10mm from the end of plasma jet.