METHOD AND INSTRUMENT FOR MEASURING ELECTRICAL CONDUCTIVITY OF SOLUTION AND WATER QUALITY CONTROL METHOD

摘要

Water quality control method and apparatus for measuring an electrical conductivity used in the water quality control; (a) electrical conductivities of an aqueous solution (10) under measurement are measured at two or more different temperatures in a range of To to Tn, and a relationship between the electrical conductivity and the temperature is obtained; (b) a solute substance in the aqueous solution (10) is determined by applying the relationship obtained in (a) to a relationship between a temperature and an electrical conductivity of an individual substance obtained beforehand; and (c) a concentration of the determined substance is estimated by applying the electrical conductivity at a lowest temperature To among the measurement temperatures in (a) to a relationship between an electrical conductivity and a concentration at the same temperature To with respect to an individual substance obtained beforehand.