Abstract
SummaryPotentiomctric titrations of a variety of natural and synthetic poly‐COOH's varying in molecular weight and COOH density gave pKm values varying from 3.5 to 5.2. The pattern of carboxylic acid group dissociation is discussed in terms of purely electrostatic assumptions and of COOH group clustering. Synthetic polymaleic acid showed many of the characteristics of both fulvic and humic acids, and therefore seems to be a reasonable representation of an average, hypothetical soil organic matter polycarboxylic acid.
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