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Environmental assessment concerning trace metals and ecological risks at Guanabara Bay, RJ, Brazil.
de Carvalho Aguiar, Valquiria Maria; Abuchacra, Paula Ferreira Falheiro; Neto, José Antônio Baptista; de Oliveira, Allan Sandes.
Afiliação
  • de Carvalho Aguiar VM; Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Universidade Federal Fluminense, Avenida General Milton Tavares de Souza, s/n, Niterói, RJ, 24210346, Brazil. val.lagemar@gmail.com.
  • Abuchacra PFF; Instituto de Geociências, Departamento de Geografia, Universidade Federal Fluminense, Avenida General Milton Tavares de Souza, s/n, Niterói, RJ, Brazil.
  • Neto JAB; Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Universidade Federal Fluminense, Avenida General Milton Tavares de Souza, s/n, Niterói, RJ, 24210346, Brazil.
  • de Oliveira AS; Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Universidade Federal Fluminense, Avenida General Milton Tavares de Souza, s/n, Niterói, RJ, 24210346, Brazil.
Environ Monit Assess ; 190(8): 448, 2018 Jul 04.
Article em En | MEDLINE | ID: mdl-29974326
Three-stage sequential extraction BCR was applied to surface sediments from the west part of Guanabara Bay to assess the mobility of Zn, Cu, Pb, Ni, Cr, and Mn. Results were satisfactory for the analysis of certificate standard material (BCR 701), with recoveries between 71 (Cu) and 123% (Cr). Evaluation of organic matter composition classified the area as eutrophic (CHO:PRT > 1), with aged organic detritus at some stations. Zn exhibited by far the greatest bioavailability, with 43.49% of its concentrations associated with the exchangeable fraction. Cu and Cr showed stronger affinity for organic matter, with 51.18 and 48.73% of their concentrations, respectively, bounded to the oxidizable fraction. Pb presented higher concentrations in the reducible fraction (45.41%). The strongest lithogenic contribution was shown by Ni (31.91%) and Mn (35.44%). PCA clearly showed the determinant role of organic matter and fine sediments in the distribution of metals in the study area and also a common source for these elements, with the exception of Cu. Risk Assessment Code (RAC) established Zn as the most concerning element in the study area. The decreasing mobility order, based on the sum of the three extractable fractions of BCR, was Pb > Cu > Cr > Zn > Ni > Mn. The comparison of the results with sediments quality guidelines (SQG) proved fractionation to be mandatory in the evaluation of effective ecological risk concerning trace elements in sediments.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Monitoramento Ambiental / Sedimentos Geológicos / Metais Pesados Tipo de estudo: Etiology_studies / Risk_factors_studies País/Região como assunto: America do sul / Brasil Idioma: En Revista: Environ Monit Assess Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Monitoramento Ambiental / Sedimentos Geológicos / Metais Pesados Tipo de estudo: Etiology_studies / Risk_factors_studies País/Região como assunto: America do sul / Brasil Idioma: En Revista: Environ Monit Assess Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda