Titre :
|
Oligoelectrolyte model for cation binding by humic substances
|
Auteurs :
|
B. Bartschat ;
S. Cabaniss ;
F. Morel
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1992
|
Format :
|
p. 284-294
|
Langues:
|
= Anglais
|
Catégories :
|
FONCTION PROPRIETE REACTION CHIMIQUE
|
Mots-clés:
|
ACIDE HUMIQUE
;
MILIEU AQUATIQUE
;
METAUX
|
Résumé :
|
An oligoelectrolyte model of humic substances is developed to explain ionic strength effects on copper and hydrogen ion titrations. After discussing the relevance of various polyelectrolyte models to humic substances, we choose a model in which the molecules are represented as impenetrable spheres. The electrostatic effect is calculated using numerical solutions of the appropriate nonlinear Poisson-Boltzmann equation. Incorporation of available data on molecular weight distribution, size, and functional group content of humic substances reduces the number of arbitrary fitting parameters.
|
Source :
|
Environmental science & technology, vol.26, n°2
|