| 摘要 |
<p>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 the operation of discharging condensed liquid in a gas phase chamber (4) to the outside is continuously conducted; an apparatus for measuring the concentration of gas dissolved in a liquid which has a gas permeation membrane (2) which is disposed in a closed vessel (1) and separates the vessel into a liquid phase chamber (3) into which the test liquid is introduced and a gas phase chamber (4) in which a pressure gauge (8) and an outlet pipe for discharging condensed liquid (7) are disposed, the degree of vacuum in the gas phase chamber (3) being measured by the pressure gauge (8); and an apparatus for producing water containing dissolved nitrogen gas which comprises the above apparatus disposed at a pipe for supplying water to an apparatus for dissolving gas to which deoxygenated ultra-pure water and nitrogen gas are supplied or a pipe for discharging water having dissolved nitrogen gas so that the amount of supplied nitrogen gas is adjusted in accordance with the concentration of dissolved gasses. The concentration of gas dissolved in a liquid flowing through a flow route can be measured as the total of the degrees of saturation with stability in a single procedure for a long period of time. Water containing dissolved nitrogen can be produced with stability.</p> |
