Assessment of bottom sediment quality in Niterói harbor (Brazil, South America) through ecological indexes concerning nutrients and trace metals.
Environ Sci Pollut Res Int
; 28(44): 62292-62305, 2021 Nov.
Article
em En
| MEDLINE
| ID: mdl-34195944
ABSTRACT
Bottom sediment quality from the Niterói harbor at Guanabara Bay (Rio de Janeiro, Brazil) was evaluated based on concentrations of organic phosphorus (OP) and inorganic phosphorus (IP) and bioavailability of trace metals through BCR fractionation analysis (Zn, Cu, Pb, Cr, Ni, Cd). The study area revealed elevated concentrations of fine sediments and organic matter (TOC 2.26-7.31%). OP presented extremely elevated concentrations between 0.57 and 47.04 µmol/g, whereas IP reached a maximum concentration of 4.99 µmol/g. The anoxic bottom at the study area was confirmed by high TOC/OP values in most stations. Phosphorus enrichment index (PEI) varied between 0.07 and 2.57, pointing to ecological risk at some stations. Trace metals were mostly bonded to the bioavailable fractions (exchangeable, reducible, oxidizable), and decreasing order of mobility was Zn > Cu > Pb > Cr > Ni > Cd. The Risk Assessment Code (RAC) suggested a high risk of bioavailability for Zinc and a medium risk for the other metals. Overall, the Niterói harbor revealed poor sediment quality suggesting a strong anthropogenic pressure in the area.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Oligoelementos
/
Poluentes Químicos da Água
/
Metais Pesados
Tipo de estudo:
Risk_factors_studies
País como assunto:
America do sul
/
Brasil
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article