Physicochemical Properties of Plasma-activated Water by Corona Discharge Plasma in Liquid Electrodes System

Abstract

The aim of this work was to determine the effects of positive and negative corona discharges on the chemical and physical properties of tap water activated at atmospheric pressure in a liquid water electrode system. The properties of tap water include pH, TDS, electrical conductivity, temperature, and the stability of active species in the solution of nitrate (NO₃), nitrite (NO₂), and hydrogen peroxide (H₂O₂). The results showed that the concentrations of NO₂, NO₃, and H₂O₂ increased with increasing applied voltage in the case of positive and negative corona discharges. The pH value of water showed different behaviors in the presence of negative and positive corona discharges. On the other hand, the behavior of other physical properties such as total dissolved solids (TDS), electrical conductivity (EC), and water temperature under applied voltage showed the same behavior in the presence of both types of corona discharges.