A new characterization procedure for aqueous solutions with unknown composition was proposed based on the binomial distribution of TOC(total organic carbon)fraction in terms of a characterizing variable, the Frundlich coefficient, K, so that the solution in question can be described by a finite number of pseudospecies identified with a certain k value. The validity and computational accuracy of this procedure has been demonstrated by characterizing three sets of experimental data chosen from different sources. Predictions based on this procedure yielded acceptable results that agreed closely with experimental data.