Solution thermochemistry of humic substances--I. Acid-base equilibria of humic acid

Details Solution thermochemistry of humic substances--I. Acid-base equilibria of humic acid Solution thermochemistry of humic substances--I. Acid-base equilibria of humic acid

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1351p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 9, pp.1351-1358

Computer Science

3

Scientific paper

The technique of titration calorimetry has been used to characterize the acidic functional groups of humic acid. Both the concentrations of acidic functional groups and the thermodynamic parameters ( pK a , H a , etc.) for ionization of these functional groups were determined. The calculated values confirm the generally accepted opinion that humic acid contains both carboxyl and phenolic hydroxyl groups. Furthermore, at least one-third of the phenolic hydroxyl groups are not ortho to carboxyl groups and thus cannot participate in chelation of metal ions via salicylate-like complexing sites. The nature of the remaining two-thirds of the phenolic hydroxyl groups is still unknown.

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