Disclosed herein are a high-sensitivity method and apparatus for monitoring
the concentration or inflow of impurities in circulating water of a circulating
water system, which can remarkably improve the measurement sensitivity by converting
carbonate ions of low conductivity into chlorine or sulfate ions of increased conductivity,
and which can measure the inflow of air or organic substances and the amount of
inflow in a simple and efficient manner in real-time. The method of the present
invention comprises the steps of: increasing a content of strong acids in sample
water and thus increasing equivalent conductivity of the impurities, by utilizing
cation exchange resin together with anion exchange resin, in which cations of the
sample water are adsorbed on the cation exchange resin to form strong acids while
weakly acidic anions of low dissociation degree in the sample water are adsorbed
on the anion exchange resin to form strong acids; and measuring the increased conductivity
of the impurities.
