Pb isotope signatures of sediments from Guanabara Bay, SE Brazil: Evidence for multiple anthropogenic sources

The dynamics of the plankton compartments at the entrance of Guanabara Bay (SE Brazil) were assessed during a short-term temporal survey to estimate their trophic correlations. Size-fractioned phytoplankton (picoplankton: < 2µm, nanoplankton: 2-20µm and microplankton: > 20µm) biomass and photosynthetic efficiency, composition and abundance of the auto-and heterotrophic nano-and microplankton, and mesozooplankton were evaluated at a fixed station for 3 consecutive days at 3-h intervals, in the surface and bottom (20m) layers. The variability of almost all plankton compartments in the surface layer was directly dependent on temperature, indicating the great influence of the circulation at the entrance of the bay on plankton structure. In the surface layer, the mesozooplankton seems to be sustained by both autotrophic nano-and picoplankton, this last being channeled through the microzooplankton. Near the bottom, both auto-and heterotrophic microplankton are probably supporting the mesozooplankton biomass. Our findings thus suggest that the entrance of Guanabara bay presents a multivorous food web, i.e., a combination of both grazing and microbial trophic pathways.

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METAL SORPTION BY SEDIMENTS FROM A MANGROVE REFORESTATION AREA IN GUANABARA BAY (SE BRAZIL) REVEALED BY USING RADIOTRACERS

Journal of Sedimentary Environments ◽

10.12957/jse.2016.23707 ◽

2016 ◽

Vol 1 (3) ◽

Author(s):

Katia Noriko Suzuki ◽

Melissa Nogueira Sondermann ◽

Edimar Carvalho Machado ◽

Wilson Machado ◽

Alfredo Victor Bernedo Bellido ◽

...

Keyword(s):

Guanabara Bay ◽

Metal Sorption ◽

Se Brazil ◽

Mangrove Reforestation

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ANTHROPOGENIC IMPACTS ON THE WESTERN SECTOR OF SEPETIBA BAY (SE DO BRAZIL) ACCESSED BY THE PB ISOTOPE COMPOSITION OF SURFACE SEDIMENTS

Journal of Sedimentary Environments ◽

10.12957/jse.2019.45269 ◽

2019 ◽

Vol 4 (3) ◽

pp. 291-311 ◽

Cited By ~ 2

Author(s):

Shéron Joyce Díaz Morales ◽

Josefa Varela Guerra ◽

Márcia Andréia Da Silva Nunes ◽

Maria Virgínia Alves Martins ◽

Ariadne Marra de Souza ◽

...

Keyword(s):

Rio De Janeiro ◽

Surface Sediments ◽

Isotope Ratios ◽

Pb Isotope ◽

Sepetiba Bay ◽

Isotope Signature ◽

Western Sector ◽

Internal Region ◽

Se Brazil ◽

Total Dissolution

This work analyses lead concentrations and isotope ratios 204Pb,206Pb,207Pb,208Pb, determined by leaching and total dissolution techniques from surface bottom sediment samples collected in the western sector of Sepetiba Bay, Rio de Janeiro (SE Brazil). The main aim of this work was to identify possible sources of Pb, particularly those related to anthropogenic activities for the study area located in the external region of this bay. Isotope ratios of 206Pb, 207Pb ranged from 1.160 to 1.259 for the total dissolution technique and from 1.175 to 1.188 for the leaching technique. The Pb isotope signature of the surface sediments of the western sector of Sepetiba Bay were compared with that obtained in other studies performed in Sepetiba Bay, including records of pre- and pos-industrial activity, and in other Brazilian regions. The isotope signature of the analyzed sediments in the western sector of Sepetiba Bay is similar to that obtained in previous works realized in the eastern and northeastern internal region of this bay which is under strong urbanization and industrial pressure. The results of Pb isotope signature obtained by the integrated use of total dissolution and leaching techniques allowed to trace the presence of sediments dredged from highly contaminated areas located in the eastern and north-eastern internal region of Sepetiba Bay probably as a consequence of dredging activities and natural processes of sediment dispersion. IMPACTOS ANTROPOGÊNICOS NO SETOR OESTE DA BAÍA DE SEPETIBA (SE DO BRASIL) ACESSADOS PELA COMPOSIÇÃO ISOTÓPICA DE PB DE SEDIMENTOS SUPERFÍCIAIS ResumoEste trabalho analisa as concentrações de chumbo (Pb) e isótopos de Pb (204Pb, 206Pb, 207Pb, 208Pb) determinados por técnicas de lixiviação e dissolução total de amostras de sedimentos de fundo, coletadas no setor oeste (região externa) da Baía de Sepetiba, no Rio de Janeiro (SE Brasil). O principal objetivo deste trabalho foi identificar possíveis fontes de Pb, principalmente aquelas relacionadas a atividades antropogênicas na área de estudo. A assinatura do isótopo Pb dos sedimentos analisados foi comparada com os dados obtidos em outros estudos realizados na Baía de Sepetiba e em outras regiões brasileiras, incluindo registros de atividade pré e pós-industrial. Na região externa da Baía de Sepetiba, os valores de 206Pb/207Pb variaram de 1.160 a 1.259 para a técnica de dissolução total e de 1.175 a 1.188 para a técnica de lixiviação. A assinatura isotópica dos sedimentos analisados é semelhante à obtida em trabalhos anteriores realizados na região interna leste e nordeste desta baía, que está sob forte influência da urbanização e pressão industrial. Os resultados da assinatura dos isótopos de Pb obtidos pelo uso integrado das técnicas de dissolução total e lixiviação permitiram rastrear, no setor oeste (região externa) da Baía de Sepetiba, a presença de sedimentos provinientes de áreas altamente contaminadas localizadas na região interna leste e nordeste da baía de Sepetiba, provavelmente como conseqüência das atividades de dragagem e processos naturais de dispersão de sedimentos. Palavras-chave: Isótopos de Pb. Geoquímica. Atividades antropogênicas. Fonte de sedimentos. Impacto de dragagem. Litoral.

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Eutrophication history of Guanabara Bay (SE Brazil) recorded by phosphorus flux to sediments from a degraded mangrove area

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2009.07.025 ◽

2009 ◽

Vol 58 (11) ◽

pp. 1750-1754 ◽

Cited By ~ 36

Author(s):

A.C. Borges ◽

C.J. Sanders ◽

H.L.R. Santos ◽

D.R. Araripe ◽

W. Machado ◽

...

Keyword(s):

Guanabara Bay ◽

Mangrove Area ◽

Se Brazil ◽

Phosphorus Flux ◽

History Of

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The contribution of heavy metal pollution derived from highway runoff to Guanabara Bay sediments: Rio de Janeiro / Brazil

Anais da Academia Brasileira de Ciências ◽

10.1590/s0001-37652007000400013 ◽

2007 ◽

Vol 79 (4) ◽

pp. 739-750 ◽

Cited By ~ 26

Author(s):

Edisio Pereira ◽

José A. Baptista-Neto ◽

Bernard J. Smith ◽

John J. Mcallister

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Particle Size Analysis ◽

Anthropogenic Sources ◽

Size Analysis ◽

Guanabara Bay ◽

Sedimentary Deposits ◽

Potential Source ◽

Run Off ◽

Near Shore

In this study, geochemical and particle size analyses of thirty-four street sediment samples collected from an urban environment around Guanabara Bay, shows highway run-off to be a potential source of heavy metals for the pollution of near-shore sedimentary deposits. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni were found to be higher in these sediments when compared to concentrations found in samples from the natural environment, where an Enrichment Factor (EF) index was used to distinguish between natural and anthropogenic sources. Particle size analysis shows these sediments to be predominantly composed of sand and no distribution pattern was observed between the sand, silt and clay fractions. High levels of organic matter and heavy metals would indicate that these street run-off materials are a potential source of pollution for the near-shore sediments of Guanabara Bay.

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Investigations into Pb isotope signatures in groundwater and sediments in a uranium-mineralized area

Brazilian Journal of Geology ◽

10.1590/2317-4889201720160100 ◽

2017 ◽

Vol 47 (1) ◽

pp. 147-158 ◽

Cited By ~ 1

Author(s):

Adriana Mônica Dalla Vecchia ◽

Paulo César Horta Rodrigues ◽

Francisco Javier Rios ◽

Ana Claudia Queiroz Ladeira

Keyword(s):

Isotopic Ratio ◽

Local Population ◽

Mining Area ◽

Anthropogenic Sources ◽

Sampling Point ◽

Uranium Deposits ◽

Pb Isotope ◽

Groundwater Samples ◽

Uranium Industry

ABSTRACT: This work presents the investigation in an environment that contains uranium deposits by using Pb isotope signatures. The study area, southeast of Brazil, is characterized by the lack of surface water and, as a consequence, the groundwater plays an important role in the economy of the region, such as the supply to the uranium industry and, above all serving the needs of the local population. The objective of the present investigation is the determination of the signatures of Pb in groundwater and sediments as well as the identification of environments under influences of geogenic and/or anthropogenic sources. It was determined that the Pb in the majority of sediments was geogenic in origin. Although data from the literature, related to the environmental studies, consider 206Pb/207Pb isotopic ratio values below or close to 1.2 as an indicative of anthropogenic Pb, the 206Pb/ 207Pb determined for the majority of groundwater samples ranged from 1.14 to 1.19, and are similar to the data reported for rocks samples (1.09 to 1.96) from area with U mineralization. It was also determined that the anthropogenic influence of the uranium was restricted to a single sampling point within the mining area.

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Trace metal retention in mangrove ecosystems in Guanabara Bay, SE Brazil

Marine Pollution Bulletin ◽

10.1016/s0025-326x(02)00232-1 ◽

2002 ◽

Vol 44 (11) ◽

pp. 1277-1280 ◽

Cited By ~ 64

Author(s):

W Machado ◽

E.V Silva-Filho ◽

R.R Oliveira ◽

L.D Lacerda

Keyword(s):

Trace Metal ◽

Guanabara Bay ◽

Metal Retention ◽

Mangrove Ecosystems ◽

Se Brazil

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Late Holocene evolution and increasing pollution in Guanabara Bay, Rio de Janeiro, SE Brazil

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2013.12.020 ◽

2014 ◽

Vol 79 (1-2) ◽

pp. 175-187 ◽

Cited By ~ 13

Author(s):

Claudia Gutterres Vilela ◽

Brígida Orioli Figueira ◽

Mariana Cardoso Macedo ◽

José Antonio Baptista Neto

Keyword(s):

Rio De Janeiro ◽

Late Holocene ◽

Guanabara Bay ◽

Se Brazil

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RADIOCARBON, TRACE ELEMENTS AND PB ISOTOPE COMPOSITION OF PINE NEEDLES FROM A HIGHLY INDUSTRIALIZED REGION IN SOUTHERN POLAND

Radiocarbon ◽

10.1017/rdc.2020.132 ◽

2021 ◽

pp. 1-14

Author(s):

Barbara Sensuła ◽

Nathalie Fagel ◽

Adam Michczyński

Keyword(s):

Trace Elements ◽

Urban Forest ◽

Isotope Composition ◽

Scintillation Counter ◽

Pine Needles ◽

Anthropogenic Sources ◽

Pb Isotope ◽

Forest Environment ◽

Southern Poland ◽

Icp Ms

ABSTRACT We determined the chemical composition of pine needles to monitor environmental contamination in an urban forest environment in the most industrialized part of southern Poland. The concentrations of radiocarbon (14C), trace elements (Cr, Co, Ni, Cu, Zn, Rb, Sr, Ba, Ce, Pb) and the Pb isotope composition were measured in needles from Pinus sylvestris L. growing in nine urban forests near five factories. The investigated young pine needles were collected in January 2013 and September 2013, respectively. 14C concentration was determined by liquid scintillation counter, trace elemental concentration and Pb isotope ratio were determined by ICP-MS and MC-ICP-MS, respectively. Analysis of trace metal pollution is based on the assumption that element concentrations in tree foliage represent element availability in the environment. Different space-time patterns of element accumulation in pine needles were observed. The variation in isotopic composition reflects a mix between different anthropogenic sources.

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