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Effect of humic acid on Cd(II), Cu(II), and Pb(II) uptake by freshwater algae: kinetic and cell wall speciation considerations

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dc.contributor.authorLamelas, C.
dc.contributor.authorPinheiro, J. P.
dc.contributor.authorSlaveykova, V. I.
dc.date.accessioned2013-12-03T14:57:05Z
dc.date.available2013-12-03T14:57:05Z
dc.date.issued2009
dc.date.updated2013-11-26T16:24:03Z
dc.description.abstractThe present study examines the effect of humic acid on the uptake kinetics of Cd(II), Cu(II), and Pb(II) by the freshwater alga Chlorella kesslerii. The results demonstrated that the relative proportion of Pb in the cell wall layer is greater than that of the internalized Pb, while internalized Cd and Cu were comparable or greater than the adsorbed metal concentration. In the presence of 10 mg L-1 humic acid (HA), Cd and Cu uptake kinetics were consistent with that predicted by measured free metal concentrations. For Pb, the uptake flux and amount of lead bound to internalization and adsorption sites were an order of magnitude higher than those found at the same free lead ion concentrations in the presence of citric acid. Chemodynamic modeling suggested that the enhancement of the Pb uptake flux in the presence of HA originates from an increasing amount of Pb bound to the internalization sites through a ternary complex formation between lead-humic acid complex and internalization sites. Cell wall speciation calculations indicated that the lead-humic acid complex is the predominant species in the cell wall layer, while for Cu(II) and Cd(II) metal bound to the internalization (Cu) and adsorption (Cd) sites significantly dominated over the M-HA complex. The findings of the work show the relevance of the cell wall layer concentration and speciation and its key role in defining the local equilibrium conditions between metal and internalizations sites. The results of the present kinetic study have important consequences for improvement of the mechanistic understanding of the role of dissolved organic matter in metal uptake in phytoplankton and biogeochemical cycling of metals in the surface waters.por
dc.identifier.citationLamelas, C.; Pinheiro, J. P.; Slaveykova, V. I. Effect of humic acid on Cd(II), Cu(II), and Pb(II) uptake by freshwater algae: Kinetic and cell wall speciation considerations, Environmental Science and Technology, 43, 3, 730-735, 2009.por
dc.identifier.issn0013-936X
dc.identifier.otherAUT: JPI01020;
dc.identifier.urihttp://hdl.handle.net/10400.1/3212
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmerican Chemical Societypor
dc.titleEffect of humic acid on Cd(II), Cu(II), and Pb(II) uptake by freshwater algae: kinetic and cell wall speciation considerationspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage735por
oaire.citation.issue3por
oaire.citation.startPage730por
oaire.citation.titleEnvironmental Science and Technologypor
oaire.citation.volume43por
person.familyNamePinheiro
person.givenNameJosé Paulo
person.identifier.orcid0000-0001-7925-9733
person.identifier.ridE-8402-2013
person.identifier.scopus-author-id35838299700
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication5caedbac-d2b5-4a86-91a7-083bf83edda3
relation.isAuthorOfPublication.latestForDiscovery5caedbac-d2b5-4a86-91a7-083bf83edda3

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