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dc.contributor.authorChen, Weibin
dc.contributor.authorGuéguen, Céline
dc.contributor.authorSmith, D. Scott
dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorPuy Llorens, Jaume
dc.contributor.authorCompanys Ferran, Encarnació
dc.date.accessioned2018-10-31T10:09:32Z
dc.date.available2019-03-02T23:19:59Z
dc.date.issued2018
dc.identifier.issn0013-936X
dc.identifier.urihttp://hdl.handle.net/10459.1/65016
dc.description.abstractThis study evaluated the influence of dissolved organic matter (DOM) properties on the speciation of Pb, Zn and Cd. Six DOM samples were categorized into autochthonous and allochthonous source based on their absorbance and fluorescence properties. The concentration of free metal ions (CM2+) measured by titration using Absence of Gradient and Nernstian Equilibrium Stripping (AGNES) was compared with that predicted by Windermere Humic Aqueous Model (WHAM). At the same binding condition (pH, dissolved organic carbon, ionic strength, and total metal concentration) the allochthonous DOM showed a higher level of Pb binding than the autochthonous DOM (84- to 504-fold CPb2+ variation). This dependency, however, was less pronounced for Zn (12- to 74-fold CZn2+ variation) and least for Cd (2- to 14-fold CCd2+ variation). The WHAM performance was affected by source variation through the active DOM fraction (F). The commonly used F = 1.3 provided reliable CPb2+ for allochthonous DOMs and acceptable CCd2+ for all DOM, but significantly underpredicted CPb2+ and CZn2+ for autochthonous DOM. Adjusting F improved CM2+ predictions, but the optimum F values were metal-specific (e.g., 0.03 - 1.9 for Pb), as showed by linear correlations with specific optical indexes. The results indicate a potential to improve WHAM by incorporating rapid measurement of DOM optical properties for site-specific F.
dc.description.sponsorshipThis work was financially supported by the Canada Research Chairs program (C.G.), and the Natural Sciences and Engineering Research Council of Canada (C.G. and D.S.S.). The authors also thank Dr. Chad Cuss for the help with data analysis. J.G., J.P., and E.C. gratefully acknowledge support for this research from the Spanish Ministry of Economy, Industry and Competitiveness MINECO (project nos. CTM2013-48967 and CTM2016-78798). The three anonymous reviewers are also acknowledged for their constructive comments that helped improve the manuscript.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.relationMINECO/PN2013-2016/CTM2013-48967
dc.relationMINECO/PN2013-2016/CTM2016-78798
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1021/acs.est.7b05302
dc.relation.ispartofEnvironmental Science & Technology, 2018, vol. 52, núm. 7, p. 4163-4172
dc.rights(c) American Chemical Society, 2018
dc.titleMetal (Pb, Cd, and Zn) Binding to Diverse Organic Matter Samples and Implications for Speciation Modeling
dc.typeinfo:eu-repo/semantics/article
dc.date.updated2018-10-31T10:09:33Z
dc.identifier.idgrec027216
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.identifier.doihttps://doi.org/10.1021/acs.est.7b05302


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