METHOD FOR MEASURING CONCENTRATION OF ANIONIC POLYMER IN WATER

摘要

PROBLEM TO BE SOLVED: To provide a method for measuring the concentration of an anionic polymer in water, with which it is possible to know the concentration of the anionic polymer easily.;SOLUTION: The method includes: a step of adding a cationic dye to test water that contains an anionic polymer, reacting the anionic polymer and the cationic dye and generating a complex, and generating a reaction liquid that contains the complex and an unreacted cationic dye; a membrane separation step of separating the reaction liquid by a membrane into a fraction that contains the complex and a filtrate that contains the unreacted cationic dye; and a concentration specification step of evaluating the filtrate about coloring by colorimetry and specifying a cationic dye concentration in the test water. The cutoff molecular weight of the membrane is smaller than the molecular weight of the anionic polymer and larger than the molecular weight of the cationic dye.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT