Conditions Extrêmes et Matériaux : Haute Température et Irradiation

utilisateur non identifié  |   Login

View CEMHTI Publication

Return to publication search...
Ask for a reprint
email :  



Maxime Wartel, Francois Faubert, Iuliana Dirlau, Steve Rudz, Nadia Pellerin, Dragos Astanei, Radu Burlica, Bogdan Hnatiuc, Stephane Pellerin, 'Analysis of Plasma Activated Water by Gliding Arc at atmospheric pressure: Effect of the chemical composition of water on the activation', J. Appl. Phys. 129 233301 (2021) doi:10.1063/5.0040035

Plasma Activated Water (PAW) is a chemically active aqueous medium characterized by the presence of Reactive Oxygen and Nitrogen Species (RONS) created by plasma exposure. This particular chemical composition is the starting point of extensive researches in several domains such as bio-disinfectant in biomedical applications or as fertilizer in agricultural applications. These various applications need adjustments of the PAW properties and consequently require a better control of the PAW chemical composition. To achieve this aim, a UV spectrophotometric method (190 to 255 nm) is implemented to simultaneously detect the nitrate and nitrite ions in plasma activated water by a gliding arc discharge reactor at atmospheric pressure. The method, tested in Plasma Activated Distilled Water (PADW) and in Plasma Activated Tap Water (PATW), shows significant increases of nitrite and nitrate concentrations. Preliminary results on PADW and PATW kinetics evolutions highlight a different behaviour of the temporal post-discharge reactions (TPDR) leading to non-conversion of the nitrite ions in case of PATW. The near non-existence of acidification during and after plasma activation encountered in PATW is due to high levels of carbonate species in tap water acting as a buffer solution. Indeed the presence of hydrogen carbonate (HCO3-) leads to the acidity consumption during plasma activation whereas the presence of non-dissolved limestone in hard water (CaCO3) acts as carbonates reserve and this induces the acidity consumption after plasma treatment.