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ANALYSIS OF THE POTENTIOMETRIC TITRATION OF NATURAL AND SYNTHETIC POLYCARBOXYLATES
Author(s) -
YOUNG S. D.,
BACHE B. W.,
WELCH D.,
ANDERSON H. A.
Publication year - 1981
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1981.tb01731.x
Subject(s) - potentiometric titration , fulvic acid , chemistry , titration , humic acid , carboxylic acid , dissociation (chemistry) , chromatography , organic chemistry , ion , fertilizer
Summary Potentiomctric 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.