The performance evaluation manner of ion-exchange resin and identification of the contaminant which is the impurity

摘要

PROBLEM TO BE SOLVED: To grasp a cause and a state of contamination and enable estimation of a use limit, etc., by carrying out identification, determination, etc., to impurities of a surface part of an ion-exchange resin by a surface analysis method. SOLUTION: In evaluating an ion-exchange resin being used in various kinds of water-treating apparatuses, preferably, a surface analysis is carried out by the Fourier transform infrared total reflection analysis method (ATR method), thereby identifying a contaminant. Moreover, a degree of contamination is obtained from an intensity ratio of the natural absorption originated from the ion-exchange resin and the absorption originated from the contaminant. For example, an anion exchange resin used in a condensation desalination tower of a power plant is detected to be contaminated with polystyrene sulfonic acid eluted from a cation exchange resin by the ATR method, so that a quantitative working curve can be formed from a standard sample. A time when the anion exchange resin should be exchanged is judged, for example, from a mass-transfer coefficient(MTC). A quantitative value of the contaminant obtained by the ATR method is correlated to the MTC, and therefore can be utilized to judge the exchange time.