Changes of pH and Electrical Conductivity of Water Treated under High-voltage Electric Field

  • G. P. Kharel Central Campus of Technology, IOSZ Tribhuvan University, B.O. Box 4, Dharan 56701
  • R Hashinaga Faculty of Agriculture, Kagoshima University, 1-21-24, Korimoto. Kagoshima 890-0065


An alternating current (AC) high-voltage electric field (HEF) (570 kV/m) broke down a water molecule into a hydrogen and an unknown ion. As a result, the pH of water decreased while the electrical conductivity (EC) increased. The decrease of pH and the increase of the EC depended on the volume of water and the period of the HEF treatment. At the end of 48 h, the pHs of the 50 mL, 100 mL, 200 mL, 300 mL and 500 mL of the HEF-treated water were 2.71, 2.79, 2.93, 2.96 and 3.03, respectively. The titration curve of the HEF-treated water exhibited a similar pattern to the strong acid-base titration curve. Acid concentration in the HEF-treated water followed an inverse linear relationship with volume of the treated water. Heat treatment (100°C for 2 h) on the HEF-treated water slightly reduced EC without affecting pH