dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorInst. Spectrochemistry Appl. S.
dc.date.accessioned2014-05-27T11:19:39Z
dc.date.available2014-05-27T11:19:39Z
dc.date.created2014-05-27T11:19:39Z
dc.date.issued1998-12-01
dc.identifierJournal of the Brazilian Chemical Society, v. 9, n. 1, p. 79-84, 1998.
dc.identifier0103-5053
dc.identifierhttp://hdl.handle.net/11449/65625
dc.identifier10.1590/S0103-50531998000100014
dc.identifierS0103-50531998000100014
dc.identifierWOS:000074749200014
dc.identifier2-s2.0-0032399538
dc.identifier2-s2.0-0032399538.pdf
dc.description.abstractThe aquatic humic substances (HS) investigated in this study with respect to their binding capability towards mercury(II) were isolated from the river Rio Negro, Amazonas State - Brazil, by means of the adsorbent XAD 8. Labile/inert fractions of inorganic Hg(II) complexes formed with these HS were characterized using an ion-exchange batch and column technique, respectively, based on Chelite S. This collector exhibits high Hg(II) distribution coefficients, Kd, up to the order of 104 decreasing, however, in the case of small Hg(II)/HS ratios (< 0.1 μg Hg(II) / mg HS). The influence of different complexation parameters (ratio of Hg(II)/HS, pH, contact time, complexing time) relevant for Hg(II) binding in aquatic environments was assessed. The Hg(II) lability in dissolved HS is mainly influenced by the mass ratio of Hg(II)/HS and the ageing of Hg(II)-HS species formed. This is particularly obvious in the case of low Hg(II) loading of HS where slow transformation processes of freshly formed Hg(II)-HS species significantly decrease their lability, leading to incomplete recoveries (< 20%) of the total Hg(II) bound to HS.
dc.languageeng
dc.relationJournal of the Brazilian Chemical Society
dc.relation1.444
dc.relation0,357
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectAquatic humic substances
dc.subjectIon exchange
dc.subjectMercury(II) speciation
dc.subjectRio Negro
dc.titleInteraction of mercury(II) with humic substances from the Rio Negro (Amazonas State, Brazil) by means of an ion exchange procedure
dc.typeArtículos de revistas


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