| abstract |
(57) Abstract: A water-soluble polymer that is a water-soluble polymer that can be produced by water-based polymerization, and that allows the concentration of the polymer itself present in the water to be treated to be measured simply, quickly and accurately. A water treatment agent containing the same is provided. SOLUTION: The water-soluble polymer is derived from a monomer component containing 1% by weight or more of water at 50 ° C. and containing a fluorescent ethylenically unsaturated water-soluble monomer. The fluorescence intensity ratio when FL was dissolved in pure water to 10 ppm was FL 1, and the fluorescence intensity when phenol was dissolved to 0.1 ppm in pure water was FL 2 , the fluorescence intensity ratio: FL 1 / FL 2 was 1 A water treatment agent containing a larger water-soluble polymer. |