| 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.
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