Method for Measuring Concentration of Gas Dissolved in Liquid, Apparatus for Measuring the Concentration and Apparatus for Producing Water Containing Dissolved Nitrogen Gas

摘要

A method for measuring the concentration of gas dissolved in a liquid, in which a test liquid is introduced into a liquid phase chamber (3) separated with a gas permeation membrane (2), and the degree of vacuum of the gas phase in equilibrium with the liquid phase is measured while condensed liquid in a gas phase chamber (4) is discharged to the outside continuously; an apparatus for measuring the concentration which has a closed vessel (1), (2) disposed in (1) and separates (1) for introducing the test liquid and (3) and (4) having a pressure gauge (8) and an outlet pipe for discharging condensed liquid (7), the degree of vacuum in (3) being measured by (8); and an apparatus for producing water containing dissolved nitrogen gas. The concentration of gas dissolved in a liquid flowing through a flow route can be measured with stability for a long time.