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Acid-base properties of aquatic fulvic acid

✍ Scribed by N. Paxéus; M. Wedborg

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
809 KB
Volume
169
Category
Article
ISSN
0003-2670

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✦ Synopsis

The acid-base properties of aquatic fulvic acid, concentrated from the GSta River, were studied by means of potentiometric titrations. The forward and reverse titrations exhibited hysteresis, which decreased as the fulvic acid underwent repeated titrations. A simple model based on six titratable groups, within the pH range 2.5-10.4, could explain the acid-base properties. Electrostatic polymeric effects and heterogeneity of the fulvic acid (i.e., a distribution of constants rather than a set of distinct constants) were not included in the model. It was found that the three most acidic groups were carboxylic.

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