Humic acids copper binding following their photochemical alteration by simulated solar light

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	2014-03-01T01:33:36Z
dc.date.available	2014-03-01T01:33:36Z
dc.date.issued	2010	en
dc.identifier.issn	1380-6165	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20484
dc.subject	Copper binding	en
dc.subject	Humic substances	en
dc.subject	Photochemical alteration	en
dc.subject	Simulated solar irradiation	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.subject.other	chemical alteration	en
dc.subject.other	chromatography	en
dc.subject.other	complexation	en
dc.subject.other	copper	en
dc.subject.other	experimental study	en
dc.subject.other	free radical	en
dc.subject.other	humic acid	en
dc.subject.other	metal binding	en
dc.subject.other	pH	en
dc.subject.other	solar radiation	en
dc.title	Humic acids copper binding following their photochemical alteration by simulated solar light	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s10498-009-9080-5	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10498-009-9080-5	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	Humic substances exposed to solar light play the role of photosensitizers in aquatic photochemical processes, generating free radicals during UV and visible light irradiation. During irradiation, high molecular weight structures are destroyed and low molecular weight constituents are formed. Alterations of the humic acids metal binding capacity due to their photochemical alterations occur. The present work reports controlled laboratory experimental results on the binding of copper by a certified purified peat humic acid (PPHA) before and after irradiation in a laboratory scale photoreactor. A reference curve of copper binding by photochemically unaltered humic acid was experimentally determined as a function of solution pH by potentiometric titrations. The experimental data series correspond to a pH range from 3 to 8.5, necessary for the simultaneous consideration of complexation and metal species solubility contribution in the obtained results. From the experimental results, it was apparent that copper is strongly bound by humic acid even at the acidic range of pH where the percentage of copper bound reached 60 and 95% at pH values of 3.5 and 5.5, respectively. During 12 and 20 days of irradiation experiments, humic acid photoalteration was experimentally monitored by a size exclusion chromatography system (HPLC-SEC). From the potentiometric titrations of the irradiated humic acid solutions by a copper selective electrode, it was apparent that the copper binding capacity of photoaltered humic acid solutions was significantly reduced for pH values up to 6. © 2009 Springer Science+Business Media B.V.	en
heal.publisher	SPRINGER	en
heal.journalName	Aquatic Geochemistry	en
dc.identifier.doi	10.1007/s10498-009-9080-5	en
dc.identifier.isi	ISI:000272613900010	en
dc.identifier.volume	16	en
dc.identifier.issue	1	en
dc.identifier.spage	207	en
dc.identifier.epage	218	en