|
Titre :
|
Humic acid complexation of calcium and copper
|
|
Auteurs :
|
J. Hering ;
M. Morel
|
|
Type de document :
|
article/chapitre/communication
|
|
Année de publication :
|
1988
|
|
Format :
|
p. 1234-1237
|
|
Langues :
|
= Anglais
|
|
Catégories :
|
FONCTION PROPRIETE REACTION CHIMIQUE
|
|
Mots-clés :
|
CALCIUM
;
CUIVRE
;
ACIDE HUMIQUE
;
MILIEU AQUATIQUE
|
|
Résumé :
|
High-affinity metal binding by isolated humic acids has been observed for both copper and calcium in metal titration experiments. Results of titrations of humic acids with a single metal ( either calcium or copper) are consistent with a discrete ligand site model of humate-metal binding. However, copper titrations in the presence of excess calcium do not show competitive effects predicted by such a model. Hence, different ligand sites must be involved in calcium and copper binding, or a binding mechanism other than discrete ligand binding must be operative.
|
|
Source :
|
Environmental science & technology, vol.22, n°10
|
