An experimental and modelling study of Cu2+ binding on humic acids at various solution conditions. 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	2014-03-01T01:35:10Z
dc.date.available	2014-03-01T01:35:10Z
dc.date.issued	2011	en
dc.identifier.issn	0049-6979	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20976
dc.subject	Copper binding	en
dc.subject	Humic substances	en
dc.subject	NICA-Donnan model	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Binding affinities	en
dc.subject.other	Concentration levels	en
dc.subject.other	Copper binding	en
dc.subject.other	Copper ions	en
dc.subject.other	Experimental data	en
dc.subject.other	Geochemical modelling	en
dc.subject.other	Humic acid	en
dc.subject.other	Humic substances	en
dc.subject.other	Metal binding	en
dc.subject.other	Model parameters	en
dc.subject.other	Modelling studies	en
dc.subject.other	Non-ideal competitive adsorptions	en
dc.subject.other	Peat humic acids	en
dc.subject.other	Selective electrodes	en
dc.subject.other	Solution conditions	en
dc.subject.other	Strong binding	en
dc.subject.other	Various pH	en
dc.subject.other	Adsorption	en
dc.subject.other	Binding energy	en
dc.subject.other	Biochemistry	en
dc.subject.other	Biological materials	en
dc.subject.other	Copper	en
dc.subject.other	Ion selective electrodes	en
dc.subject.other	Ionic strength	en
dc.subject.other	Metal ions	en
dc.subject.other	Organic acids	en
dc.subject.other	Organic pollutants	en
dc.subject.other	Soil pollution	en
dc.subject.other	Enzyme immobilization	en
dc.subject.other	copper hydroxide	en
dc.subject.other	cupric ion	en
dc.subject.other	humic acid	en
dc.subject.other	inorganic salt	en
dc.subject.other	peat	en
dc.subject.other	unclassified drug	en
dc.subject.other	adsorption	en
dc.subject.other	bioavailability	en
dc.subject.other	concentration (composition)	en
dc.subject.other	copper	en
dc.subject.other	experimental study	en
dc.subject.other	humic acid	en
dc.subject.other	humic substance	en
dc.subject.other	metal binding	en
dc.subject.other	mobility	en
dc.subject.other	numerical model	en
dc.subject.other	organic pollutant	en
dc.subject.other	pH	en
dc.subject.other	adsorption	en
dc.subject.other	article	en
dc.subject.other	binding affinity	en
dc.subject.other	concentration response	en
dc.subject.other	controlled study	en
dc.subject.other	copper ion selective electrode	en
dc.subject.other	experimental model	en
dc.subject.other	experimental study	en
dc.subject.other	geochemistry	en
dc.subject.other	Greece	en
dc.subject.other	humic substance	en
dc.subject.other	ion selective electrode	en
dc.subject.other	ionic strength	en
dc.subject.other	metal binding	en
dc.subject.other	pH	en
dc.subject.other	soil	en
dc.title	An experimental and modelling study of Cu2+ binding on humic acids at various solution conditions. Application of the NICA-Donnan model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s11270-010-0662-z	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s11270-010-0662-z	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Humic substances are characterized by a strong binding capacity for both metals and organic pollutants, affecting their mobility and bioavailability. The understanding of the mechanisms of proton and metal binding to humic substances is of fundamental importance in geochemical modelling and prediction of cation speciation in the environment. This work reports results on copper binding on humic acids obtained through a thorough experimental and modelling approach. Two humic acids, a reference purified peat humic acid isolated by the International Humic Substances Society (IHSS) and a humic acid from a Greek soil, were experimentally studied at various pH values (4,6 and 8), humic acid concentrations (ranging from 20 to 200 mg L-1) and ionic strength (0.1 and 0.01 M NaNO3). The binding of copper to humic acids was determined over wide ranges of copper ion concentrations using a copper ion selective electrode. The copper binding isotherms obtained at different conditions have shown that copper binding is dependent on the pH and ionic strength of the solution and on the concentration of both humic acids. Copper binding experimental data were fitted to non-ideal competitive adsorption NICA-Donnan model and the model parameter values were calculated. Both Cu 2+ and CuOH+ species binding to humic acid with different binding affinities were considered. Two sets of the NICA-Donnan parameters have been calculated: one for humic acid concentrations of ≥100 mgL -1and one for humic acid concentration of 20 mgL-1. The meaning of the parameters values for each concentration level is also discussed. © Springer Science+Business Media B.V. 2010.	en
heal.publisher	SPRINGER	en
heal.journalName	Water, Air, and Soil Pollution	en
dc.identifier.doi	10.1007/s11270-010-0662-z	en
dc.identifier.isi	ISI:000290724400044	en
dc.identifier.volume	218	en
dc.identifier.issue	1-4	en
dc.identifier.spage	487	en
dc.identifier.epage	497	en