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

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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 http://hdl.handle.net/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

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