PURPOSE:To make it possible to analyze cation starch, flocculant having super- high molecular weight and the like which cannot be determined by conventional methods by using super-dilute standard normal solution for determining the concentration of macromolecular electrolyte solution. CONSTITUTION:A specified % of PDMA is put into a beaker. The beaker is mounted on a magnetic stirrer which is attached to the sample chamber of a fluorescence spectrophotometer. A specified amount of AF is added during stirring, and the intensity of fluorescence is read. A specified quantity of PVSK standard solution whose concentration is lower than the normal value of 1/5,000 is added into the beaker from a microburet, and the intensity of the fluorescence is read. This operation is sequentially repeated, and the titration curve shown in the figure is obtained based on the obtained measured values. The concentra tion of the liquid under test is accurately obtained from the bending point of the titration curve.
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