| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for controlling the concentration of a chemical for water treatment which measures the concentration of the chemical added into water easily, promptly, and accurately. SOLUTION: A known amount of coloring matter which is water soluble, light resistant, and oxidation resistant is dispersed as a tracer by a dispersant with a known amount of the chemical for water treatment in water such as cooling water in an open system. The concentration of the coloring matter in the water is detected optically by measuring the absorption of the coloring matter preferably at two or more wavelengths including at least one wavelength of absorption, preferably by absorptiometry. By determining the concentration of the chemical in the water from the detected concentration of the coloring matter proportional to the known amount of the chemical, the concentration of the chemical added into the water is controlled properly. As the coloring matter as a tracer, WA Color Blue A-01 (using C. I Pigment Blue 15, dispersed by a water soluble resin) (R) of Dainichi Seika Ind. Company can be used especially preferably.
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