Diffusion coefficient measuring method and diffusion coefficient measuring apparatus

摘要

PROBLEM TO BE SOLVED: To make it possible to measure a mutual diffusion coefficient in a short time.SOLUTION: The present invention is provided with: a micro flow channel 112; a measurement unit 102 for measuring a composite concentration when at least a first and a second liquid are mixed via the micro flow channel 112 and the first and the second liquids are mutually diffused; and a calculation unit 102 for approximating a relational expression (expression 18) representing relationship between the composite concentration measured by the measurement unit 102 and the diffusion coefficients D, Dof each of the first and the second liquids, and calculating each of the diffusion coefficients D, Dof the first and the second liquids on the basis of the relational expression (expression 18) and the measured value of the composite concentration.