An experimental and modeling study of humic acid concentration effect on H+ binding: Application of the NICA-Donnan model

Vidali, R; Remoundaki, E; Tsezos, M

dc.contributor.author	Vidali, R	en
dc.contributor.author	Remoundaki, E	en
dc.contributor.author	Tsezos, M	en
dc.date.accessioned	2014-03-01T01:29:50Z
dc.date.available	2014-03-01T01:29:50Z
dc.date.issued	2009	en
dc.identifier.issn	0021-9797	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19362
dc.subject	Humic concentration effect	en
dc.subject	Humic substances	en
dc.subject	NICA-Donnan model	en
dc.subject	Proton binding	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.other	Cation binding	en
dc.subject.other	Concentration levels	en
dc.subject.other	Concentration of	en
dc.subject.other	Dissolved fraction	en
dc.subject.other	Experimental data	en
dc.subject.other	Humic acid	en
dc.subject.other	Humic concentration effect	en
dc.subject.other	Humic substances	en
dc.subject.other	Model parameters	en
dc.subject.other	Modeling approach	en
dc.subject.other	Modeling studies	en
dc.subject.other	Natural aquatic systems	en
dc.subject.other	Natural organic matters	en
dc.subject.other	NICA-Donnan model	en
dc.subject.other	Peat humic acids	en
dc.subject.other	Positively charged	en
dc.subject.other	Proton binding	en
dc.subject.other	Soluble metals	en
dc.subject.other	Strong binding	en
dc.subject.other	Atmospheric temperature	en
dc.subject.other	Biochemistry	en
dc.subject.other	Biological materials	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Dissolution	en
dc.subject.other	Enzyme immobilization	en
dc.subject.other	Metal refining	en
dc.subject.other	Organic acids	en
dc.subject.other	Organic pollutants	en
dc.subject.other	Protons	en
dc.subject.other	Soil pollution	en
dc.subject.other	humic acid	en
dc.subject.other	organic matter	en
dc.subject.other	proton	en
dc.subject.other	article	en
dc.subject.other	binding kinetics	en
dc.subject.other	bioavailability	en
dc.subject.other	colloid	en
dc.subject.other	concentration (parameters)	en
dc.subject.other	controlled study	en
dc.subject.other	experimental model	en
dc.subject.other	hydrogen bond	en
dc.subject.other	isotherm	en
dc.subject.other	mathematical analysis	en
dc.subject.other	prediction	en
dc.subject.other	priority journal	en
dc.subject.other	soil analysis	en
dc.subject.other	Humic Substances	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Models, Chemical	en
dc.subject.other	Physicochemical Phenomena	en
dc.subject.other	Protons	en
dc.subject.other	Soil Pollutants	en
dc.title	An experimental and modeling study of humic acid concentration effect on H+ binding: Application of the NICA-Donnan model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jcis.2009.07.060	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jcis.2009.07.060	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Humic substances are the most abundant components of the colloidal and the dissolved fraction of natural organic matter (NOM) and they are characterized by a strong binding capacity for both metals and organic pollutants, affecting their mobility and bioavailability. The understanding of the humic acidic character is the first necessary step for the study of the mechanisms of binding of other positively charged soluble metal species by humic molecules. The present work, which constitutes part of the Ph.D. thesis of Roza Vidali, reports results on the influence of the concentration of humic acids on the binding of protons obtained through both an experimental and a modeling approach. A reference purified peat humic acid (PPHA) isolated by the International Humic Substances Society (IHSS) and a humic acid from a Greek soil (GHA) were experimentally studied at various humic acid concentrations, ranging from 20 to 200 mg L-1. The proton binding isotherms obtained at different humic acid concentrations have shown that proton binding is dependent on the concentration of both humic acids. Proton binding experimental data were fitted to the NICA-Donnan model and the model parameter values were calculated for humic acid concentrations of 20 and >= 100 mg L-1. The results obtained for the NICA-Donnan parameters at humic acid concentrations >= 100 mg L-1 are in excellent agreement with those reported in the literature. However, these model parameter values cannot be used for modeling and predicting cation binding in natural aquatic systems, where humic acid concentrations are much lower. Two sets of the NICA-Donnan parameters are reported: one for humic acid concentrations of >= 100 ring L-1 and one for humic acid concentration of 20 mg L-1. The significance of the parameters values for each concentration level is also discussed. (C) 2009 Elsevier Inc. All rights reserved.	en
heal.publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE	en
heal.journalName	Journal of Colloid and Interface Science	en
dc.identifier.doi	10.1016/j.jcis.2009.07.060	en
dc.identifier.isi	ISI:000270748500008	en
dc.identifier.volume	339	en
dc.identifier.issue	2	en
dc.identifier.spage	330	en
dc.identifier.epage	335	en