Titration curves of humic acids extracted from different sources were fitted using a continuous distribution model. The mean pK values and distribution variances were calculated in the fitting procedure and they proved to be useful in differentiation of the humic acids under examination
A NORMAL-DISTRIBUTION MODEL FOR THE TITRATION CURVES OF HUMIC ACIDS / Manunza, B; Gessa, C; Deiana, Salvatore Andrea; Rausa, R.. - In: THE JOURNAL OF SOIL SCIENCE. - ISSN 0022-4588. - 43:1(1992), pp. 127-131.