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Trace metal dynamics in an industrialized Brazilian river:A combined application of Zn isotopes,geochemical partitioning,and multivariate statistics

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Journal of Environmental Sciences 2021年第3期33卷 313-325页

作者： Myller S.Tonhá Daniel f.Araújo Rafael Araújo Bruno C.A.Cunha Wilson Machado joelma f.portela João PR Souza Hikari K.Carvalho Elton L.Dantas Henrique L.Roig Patrick Seyler Jeremie Garnier Universidade de Brasília Instituto de GeociênciasCampus Darcy RibeiroL2Asa Norte70910900 BrasíliaDistrito FederalBrazil Laboratoire de Biogéochimie des Contaminants Métalliques IfremerCentre AtlantiqueF44311 Nantes Cedex 3France Institute of Geosciences University of São PauloRua do Lago562São Paulo 05508-080Brazil Universidade federal fluminense Programa de GeoquímicaCampus do ValonguinhoNiteróiRio de JaneiroBrazil Analytical and Environmental Chemistry Laboratory Instituto de QuímicaUniversity of BrasiliaBrasiliaFederal District 70919-970Brazil Laboratoire Mixte International“Observatoire des Changements Environnementaux”(LMI OCE) Institut de Recherche pour le Développement/University of BrasiliaCampus Darcy RibeiroBrasiliaBrazil Hydrosciences Montpellier Universitéde MontpellierInstitut de Recherche pour le développementCentre National de la Recherche ScientifiqueMontpellierFrance

The Paraiba do Sul(PSR)and Guandu Rivers(GR)water diversion system(120 km long)is located in the main industrial pole of Brazil and supplies drinking water for 9.4 million people in the metropolitan region of Rio de *** study aims to discern the trace metals dynamics in this complex aquatic *** used a combined approach of geochemical tools such as geochemical partitioning,Zn isotopes signatures,and multivariate *** and Pb concentrations in Suspended Particulate Matter(SPM)and sediments were considerably higher in some *** sediment partition of As,Cr,and Cu revealed the residual fraction(f4)as the main fraction for these elements,indicating low *** and Pb were mostly associated with the exchangeable/carbonate(f1)and the reducible(f2)fractions,respectively,implying a higher susceptibility of these elements to being released from *** isotopic compositions of sediments and SPM fell in a binary mixing source process between lithogenic(δ^(66/64)Zn_(JMC)≈+0.30‰)and anthropogenic(δ^(66/64)Zn_(JMC)≈+0.15‰)end *** lighterδ^(66/64)Zn_(JMC)values accompanied by high Zn concentrations in exchangeable/carbonate fraction(Znf1)enable the tracking of Zn anthropogenic sources in the studied ***,the results indicated that Hg,Pb,and Zn had a dominant anthropogenic origin linked to the industrial activities,while As,Cr,and Cu were mainly associated with lithogenic *** work demonstrates how integrating geochemical tools is valuable for assessing geochemical processes and mixing source effects in anthropized river watersheds.

关键词： Metal pollution Isotope tracer Sequential extraction Anthropogenic activity

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