Abstract: Grape spirit with a 85.0% alcohol content was diluted with soft water to 40.2%, various electrochemical properties including pH, dissolved oxygen (DO) value, oxidation reduction potential (ORP) value and conductivity were on-line measured using a multi-parameter analyzer in this study. It was demonstrated that during the dilution process, the pH value increased first, then declined, and finally reached a stable value of 5.10.The DO value increased gradually until saturation was reached.The ORP value decreased sharply at first and then increased step by step to a stable value. On the other hand, the conductivity gradually increased during the whole dilution process.

Key words: spirit, dilution, electrochemical properties, on-line measurement