1. Repository of OAI
  2. ΑΠΟΘΕΤΗΡΙΟ "ΟΛΥΜΠΙΑΣ"
  3. Σχολή Θετικών Επιστημών
  4. Τμήμα Χημείας
  5. Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά). ΧΗΜ
Ελληνικά   English  
Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/8197
Full metadata record
DC FieldValueLanguage
dc.contributor.authorGiannakopoulos, E.en
dc.contributor.authorChristoforidis, K. C.en
dc.contributor.authorTsipis, A.en
dc.contributor.authorJerzykiewicz, M.en
dc.contributor.authorDeligiannakis, Y.en
dc.date.accessioned2015-11-24T16:39:49Z-
dc.date.available2015-11-24T16:39:49Z-
dc.identifier.issn1089-5639-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/8197-
dc.rightsDefault Licence-
dc.subjectelectron-spin-resonanceen
dc.subjectaqueous-solution interfaceen
dc.subjectmolecular wave functionsen
dc.subjectmetal-ionsen
dc.subjectparamagnetic-resonanceen
dc.subjectorganic-matteren
dc.subjectgallic aciden
dc.subjectg-tensorsen
dc.subjectantioxidant activityen
dc.subjectpopulation analysisen
dc.titleInfluence of Pb(II) on the radical properties of humic substances and model compoundsen
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.primaryDoi 10.1021/Jp045121q-
heal.identifier.secondary<Go to ISI>://000227630200024-
heal.identifier.secondaryhttp://pubs.acs.org/doi/pdfplus/10.1021/jp045121q-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.publicationDate2005-
heal.abstractThe influence of Pb(II) ions on the properties of the free radicals formed in humic acids and fulvic acids was investigated by electron paramagnetic resonance spectroscopy. It is shown that, in both humic acid and fulvic acid, Pb(II) ions shift the radical formation equilibrium by increasing the concentration of stable radicals. Moreover, in both humic acid and fulvic acid, Pb(II) ions cause a characteristic lowering of the stable radicals' g-values to g = 2.0010, which is below the free electron g-value. This effect is unique for Pb ions and is not observed with other dications. Gallic acid (3,4,5-trihydroxybenzoic acid) and tannic acid are shown to be appropriate models for the free radical properties, i.e., g-values, Pb effect, pH dependence, of humic and fulvic acid, respectively. On the basis of density functional theory calculations for the model system (gallic acid-Pb), the observed characteristic g-value reduction upon Pb binding is attributed to the delocalization of the unpaired spin density onto the Pb atom. The present data reveal a novel environmental role of Pb(II) ions on the formation and stabilization of free radicals in natural organic matter.en
heal.journalNameJournal of Physical Chemistry Aen
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά). ΧΗΜ

Show simple item record
Files in This Item:
File Description SizeFormat 
Giannakopoulos-2005-Influence of Pb(II).pdf316.33 kBAdobe PDFView/Open    Request a copy
Show simple item record  


This item is licensed under a Creative Commons License Creative Commons