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

Type Article
Date 2021-03
Language English
Author(s) Tonhá Myller S.1, Ferreira Araujo Daniel2, Araújo Rafael1, Cunha Bruno C.A.3, Machado Wilson4, Portela Joelma F.5, Pr Souza João5, Carvalho Hikari K.1, Dantas Elton L.1, Roig Henrique L.1, 6, Seyler Patrick3, 7, Garnier Jeremie1, 6
Affiliation(s) 1 : Universidade de Brasília, Instituto de Geociências, Campus Darcy Ribeiro, L2, Asa Norte, 70910900 Brasília, Distrito Federal, Brazil
2 : Laboratoire de Biogéochimie des Contaminants Métalliques, Ifremer, Centre Atlantique, F44311 Nantes Cedex 3, France
3 : Institute of Geosciences, University of São Paulo, Rua do Lago, 562, São Paulo 05508-080, Brazil
4 : Universidade Federal Fluminense, Programa de Geoquímica, Campus do Valonguinho, Niterói, Rio de Janeiro, Brazil
5 : Analytical and Environmental Chemistry Laboratory, Instituto de Química, University of Brasilia, Brasilia, Federal District 70919-970, Brazil
6 : Laboratoire Mixte International “Observatoire des Changements Environnementaux” (LMI OCE), Institut de Recherche pour le Développement/University of Brasilia, Campus Darcy Ribeiro, Brasilia, Brazil
7 : Hydrosciences Montpellier, Université de Montpellier, Institut de Recherche pour le développement, Centre National de la Recherche Scientifique, Montpellier, France
Source Journal Of Environmental Sciences (1001-0742) (Elsevier BV), 2021-03 , Vol. 101 , P. 313-325
DOI 10.1016/j.jes.2020.08.027
WOS© Times Cited 13
Keyword(s) Metal pollution, Isotope tracer, Sequential extraction, Anthropogenic activity

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 Janeiro. This study aims to discern the trace metals dynamics in this complex aquatic system. We used a combined approach of geochemical tools such as geochemical partitioning, Zn isotopes signatures, and multivariate statistics. Zinc and Pb concentrations in Suspended Particulate Matter (SPM) and sediments were considerably higher in some sites. The sediment partition of As, Cr, and Cu revealed the residual fraction (F4) as the main fraction for these elements, indicating low mobility. Zinc 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 sediments. Zinc isotopic compositions of sediments and SPM fell in a binary mixing source process between lithogenic (δ66/64ZnJMC ≈ + 0.30‰) and anthropogenic (δ66/64ZnJMC ≈ + 0.15‰) end members. The lighter δ66/64ZnJMC values accompanied by high Zn concentrations in exchangeable/carbonate fraction (ZnF1) enable the tracking of Zn anthropogenic sources in the studied rivers. Overall, 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 sources. This work demonstrates how integrating geochemical tools is valuable for assessing geochemical processes and mixing source effects in anthropized river watersheds.

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Tonhá Myller S., Ferreira Araujo Daniel, Araújo Rafael, Cunha Bruno C.A., Machado Wilson, Portela Joelma F., Pr Souza João, Carvalho Hikari K., Dantas Elton L., Roig Henrique L., Seyler Patrick, Garnier Jeremie (2021). Trace metal dynamics in an industrialized Brazilian river: A combined application of Zn isotopes, geochemical partitioning, and multivariate statistics. Journal Of Environmental Sciences, 101, 313-325. Publisher's official version : , Open Access version :