Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/49839
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dc.contributor.authorSantana-Casiano, J. Magdalenaen_US
dc.contributor.authorGonzalez-Davila, Melchoren_US
dc.contributor.authorPerez-Peña, Jesusen_US
dc.contributor.authorMillero, Frank J.en_US
dc.date.accessioned2018-11-24T11:08:04Z-
dc.date.available2018-11-24T11:08:04Z-
dc.date.issued1995en_US
dc.identifier.issn0304-4203en_US
dc.identifier.urihttp://hdl.handle.net/10553/49839-
dc.description.abstractMetal ions become adsorbed to algal surface groups and complexed to organic material released by algae at all growth stages influencing their distribution in the seawater. In this study, the differential pulse anodic stripping voltammetry (DPASV) technique was used to evaluate the adsorption and the interaction between the exudates excreted by the marine algae Dunaliella tertiolecta and Pb2+. The adsorption process has been studied in seawater as a function of pH (2 to 8), temperature (5 to 45 °C), salinity (5 to 36), biomass and the presence of a second metal, copper. The rate of adsorption was found to occur in two steps: first a relatively fast adsorption step (10 min) and second, a slow, diffusion-controlled uptake into the cells. A two-site model which considers the presence of two major functional groups, namely: high-affinity binding and low-affinity binding was used to fit the experimental data. The values for the stability constants of Pb2 on these two groups were log ∗KH,1S = 8.40 ± 0.18 and log ∗KH,2S = 7.25 ± 0.31. The high-affinity constant similar to the complexing capacity of the exudates (log ∗KMe2+ = 8.40 ± 0.05) produced by the alga showing that extracellular ligands play an important role in buffering the concentration of the free metal concentration. A decrease in the temperature and salinity result in lower adsorption of Pb2+ to the algae and a higher complexation of lead with the exudate. The presence of copper decreases the lead complexation to the algal surface by 70%.en_US
dc.languageengen_US
dc.publisher0304-4203
dc.relation.ispartofMarine Chemistryen_US
dc.sourceMarine Chemistry [ISSN 0304-4203], v. 48, p. 115-129en_US
dc.subject251002 Oceanografía químicaen_US
dc.subject.otherNatural Organic-Ligands
dc.subject.otherMetal-Ion Binding
dc.subject.otherCopper Complexation
dc.subject.otherComplexing Capacity
dc.subject.otherStripping Voltammetry
dc.subject.otherNortheast Pacific
dc.subject.otherSea-Water
dc.subject.otherSeawater
dc.subject.otherCu(Ii)
dc.subject.otherZinc
dc.titlePb2+ interactions with the marine phytoplankton Dunaliella tertiolectaen_US
dc.typeinfo:eu-repo/semantics/Articleen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/0304-4203(95)91418-K
dc.identifier.scopus0028976292-
dc.identifier.isiA1995QE41500003
dc.contributor.authorscopusid6701344294-
dc.contributor.authorscopusid6603931257-
dc.contributor.authorscopusid7004839316-
dc.contributor.authorscopusid35459562600-
dc.description.lastpage129-
dc.description.firstpage115-
dc.relation.volume48-
dc.investigacionCienciasen_US
dc.type2Artículoen_US
dc.contributor.daisngid579253
dc.contributor.daisngid518149
dc.contributor.daisngid1479300
dc.contributor.daisngid18489
dc.utils.revisionen_US
dc.contributor.wosstandardWOS:SANTANACASIANO, JM
dc.contributor.wosstandardWOS:GONZALEZDAVILA, M
dc.contributor.wosstandardWOS:PEREZPENA, J
dc.contributor.wosstandardWOS:MILLERO, FJ
dc.date.coverdateEnero 1995
dc.identifier.ulpgces
dc.description.scieSCIE
item.grantfulltextnone-
item.fulltextSin texto completo-
crisitem.author.deptGIR IOCAG: Química Marina-
crisitem.author.deptIU de Oceanografía y Cambio Global-
crisitem.author.deptDepartamento de Química-
crisitem.author.deptGIR IOCAG: Química Marina-
crisitem.author.deptIU de Oceanografía y Cambio Global-
crisitem.author.deptDepartamento de Química-
crisitem.author.deptGIR IUNAT: Fotocatálisis y espectroscopía para aplicaciones medioambientales.-
crisitem.author.deptIU de Estudios Ambientales y Recursos Naturales-
crisitem.author.orcid0000-0002-7930-7683-
crisitem.author.orcid0000-0003-3230-8985-
crisitem.author.orcid0000-0003-1889-2281-
crisitem.author.parentorgIU de Oceanografía y Cambio Global-
crisitem.author.parentorgIU de Oceanografía y Cambio Global-
crisitem.author.parentorgIU de Estudios Ambientales y Recursos Naturales-
crisitem.author.fullNameSantana Casiano, Juana Magdalena-
crisitem.author.fullNameGonzález Dávila, Melchor-
crisitem.author.fullNamePérez Peña,Jesús-
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