A method is described for the analytical determination of low concentrations of polyacrylamide or polyethyleneoxide flocculants in water, in the range 0–10 parts/106. It depends on measuring the turbidity produced by mixing the polymer solution with a dilute solution of tannic acid in the presence of 1 m NaCl. With a sensitive nephelometer, as little as 0.1 parts/106 of flocculant can be detected.
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