MECHANISM OF FORMATION OF HUMUS COATINGS ON MINERAL SURFACES .1. EVIDENCE FOR MULTIDENTATE BINDING OF ORGANIC-ACIDS FROM COMPOST LEACHATE ON ALUMINA

Authors
WERSHAW RL LEENHEER JA SPERLINE RP SONG YA NOLL LA MELVIN RL RIGATTI GP
Citation
Rl. Wershaw et al., MECHANISM OF FORMATION OF HUMUS COATINGS ON MINERAL SURFACES .1. EVIDENCE FOR MULTIDENTATE BINDING OF ORGANIC-ACIDS FROM COMPOST LEACHATE ON ALUMINA, Colloids and surfaces. A, Physicochemical and engineering aspects, 96(1-2), 1995, pp. 93-104
Citations number
19
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
96
Issue
1-2
Year of publication
1995
Pages
93 - 104
Database
ISI
SICI code
0927-7757(1995)96:1-2<93:MOFOHC>2.0.ZU;2-E
Abstract
Measurements of the infrared linear dichroism of carboxylate groups of organic acids from compost leachate adsorbed to an alumina surface an d the enthalpy of adsorption of this reaction have been made. The line ar dichroism measurements indicated that the carboxylate groups are no t free to rotate. This limited rotation probably results from bidentat e binding of the carboxylate groups. The molar enthalpy of adsorption of the acids is approximately -100 kJ mol(-1). This high value for ent halpy of adsorption may best be explained by assuming that two or more carboxylate groups on a single dissolved organic carbon (DOC) molecul e coordinate to the surficial aluminium ions.