METHOD AND DEVICE FOR MEASURING WATER OF CLEANING AGENT

摘要

PROBLEM TO BE SOLVED: To provide a method and device for measuring water of a cleaning agent, capable of easily and accurately measuring a water content in the cleaning agent.SOLUTION: A method for measuring water in a cleaning agent (A) including water at a ratio of 1 mass% or more and less than 50 mass% or a cleaning agent (B) capable of mixing water derived from a contaminant therein without substantially including water comprises: the step of measuring the refractive index of the cleaning agent (A) or (B) by a refractive index measurement part 1; the step of measuring the density of the cleaning agent (A) or (B) by a density measurement part 2; and the calculation step of calculating a water content by a water calculation part 4 using a calibration curve previously formed on the basis of correlations among the water content, refractive index and density of the cleaning agent (A) or (B).