CONCENTRATION DETECTION ELEMENT FOR SOLUTE IN AQUEOUS SOLUTION

摘要

This invention provides a solute in an aqueous solution concentration detection element sealed airtight by a porous non-water-permeable fluororesin film or a two-layered film of a porous non-water-permeable fluororesin film and a selective vapor permeable layer or a three-layered film of a porous non-water-permeable fluororesin film, a selective vapor permeable layer and an acid vapor absorption layer, by utilizing a property that the concentration of a solute in an aqueous solution is closely associated with the vapor pressure of the aqueous solution.