Longitudinal chemical gradients in estuarine systems
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/27756 |
Resumo: | Coastal ecosystems are subject to periodical changes on physico-chemical characteristics that influence the behavior of major, minor and potential toxic elements. Ria de Aveiro lagoon is a shallow and vertically homogenous estuarine system, located on the northwestern part of Portugal’s Atlantic coast (40° 38’N, 8° 45’W). It is composed of various narrow channels which converge onto a single opening to the ocean, resulting in an area with large mud flats and salt marshes. This system is subject to intensive anthropological pressure, which is the main source of the elevated levels of contaminants present within it. The objective of this work was to study the longitudinal and tidal variability of the distribution of major, minor and potential toxic elements in this well-known estuarine system with varying physico-chemical properties. The areas of study were two channels of the Ria de Aveiro estuary. Water column samples were collected from various points along the length of both channels, Mira and Ílhavo, as well as various measurements for water salinity, conductivity, temperature, pH, suspended particulate matter and dissolved oxygen. The partitioning in dissolved and particulate fractions as well, as the dispersion along both channels, were determined for Li, B, Mg, Al, K, Ca, Ti, Mn, Fe, Co, Ni, Cu, Zn, As, Sr, Ba, Hg and U. It was observed that the behavior of elements determined in one channel varied substantially in the other channel, with variations dependent on the physico-chemical parameters, as well as fresh water flow rate and proximity to anthropological pressures. |
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Longitudinal chemical gradients in estuarine systemsMarine ecosystemEstuarine systemsMajor elementsPotential toxic elementsLongitudinal and tidal variationCoastal ecosystems are subject to periodical changes on physico-chemical characteristics that influence the behavior of major, minor and potential toxic elements. Ria de Aveiro lagoon is a shallow and vertically homogenous estuarine system, located on the northwestern part of Portugal’s Atlantic coast (40° 38’N, 8° 45’W). It is composed of various narrow channels which converge onto a single opening to the ocean, resulting in an area with large mud flats and salt marshes. This system is subject to intensive anthropological pressure, which is the main source of the elevated levels of contaminants present within it. The objective of this work was to study the longitudinal and tidal variability of the distribution of major, minor and potential toxic elements in this well-known estuarine system with varying physico-chemical properties. The areas of study were two channels of the Ria de Aveiro estuary. Water column samples were collected from various points along the length of both channels, Mira and Ílhavo, as well as various measurements for water salinity, conductivity, temperature, pH, suspended particulate matter and dissolved oxygen. The partitioning in dissolved and particulate fractions as well, as the dispersion along both channels, were determined for Li, B, Mg, Al, K, Ca, Ti, Mn, Fe, Co, Ni, Cu, Zn, As, Sr, Ba, Hg and U. It was observed that the behavior of elements determined in one channel varied substantially in the other channel, with variations dependent on the physico-chemical parameters, as well as fresh water flow rate and proximity to anthropological pressures.Os ecossistemas costeiros estão sujeitos a mudanças periódicas nas suas características físico-químicas que influenciam o comportamento de elementos maioritários, minoritários e potencialmente tóxicos. A Ria de Aveiro é um sistema estuarino pouco profundo e verticalmente homogéneo, localizado na parte noroeste da costa atlântica de Portugal (40 ° 38'N, 8 ° 45'W). É composta por vários canais estreitos que convergem para uma única abertura para o oceano, resultando numa área com grandes planícies de lama e sapais. Este sistema está sujeito a uma intensa pressão antropológica, que é a principal fonte dos níveis elevados de contaminantes presentes dentro deste. O objetivo deste trabalho foi estudar a variabilidade longitudinal, das marés e da distribuição dos elementos maioritários, minoritários e potencialmente tóxicos num sistema estuarino bem conhecido, com propriedades físico-químicas variáveis. As áreas de estudo foram dois canais da Ria de Aveiro. Amostras de colunas de água foram recolhidas de vários pontos situados ao longo do comprimento de ambos os canais, Mira e Ílhavo, onde foram efetuadas medições de salinidade, condutividade, temperatura, pH, material particulado em suspensão e oxigênio dissolvido. A separação em frações dissolvidas e particuladas, assim como a dispersão ao longo de ambos os canais, foram avaliadas para o Li, B, Mg, Al, K, Ca, Ti, Mn, Fe, Co, Ni, Cu, Zn, As, Sr, Ba, Hg e U. Observou-se que o comportamento dos elementos determinados num canal variou substancialmente no outro canal, com variações a depender dos parâmetros físico-químicos, fluxo de água doce e proximidade a pressões antropológicas.2020-03-02T20:12:39Z2019-01-01T00:00:00Z2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/27756engSoares, José Alexandre Manoinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:53:54Zoai:ria.ua.pt:10773/27756Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:00:30.382681Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Longitudinal chemical gradients in estuarine systems |
title |
Longitudinal chemical gradients in estuarine systems |
spellingShingle |
Longitudinal chemical gradients in estuarine systems Soares, José Alexandre Mano Marine ecosystem Estuarine systems Major elements Potential toxic elements Longitudinal and tidal variation |
title_short |
Longitudinal chemical gradients in estuarine systems |
title_full |
Longitudinal chemical gradients in estuarine systems |
title_fullStr |
Longitudinal chemical gradients in estuarine systems |
title_full_unstemmed |
Longitudinal chemical gradients in estuarine systems |
title_sort |
Longitudinal chemical gradients in estuarine systems |
author |
Soares, José Alexandre Mano |
author_facet |
Soares, José Alexandre Mano |
author_role |
author |
dc.contributor.author.fl_str_mv |
Soares, José Alexandre Mano |
dc.subject.por.fl_str_mv |
Marine ecosystem Estuarine systems Major elements Potential toxic elements Longitudinal and tidal variation |
topic |
Marine ecosystem Estuarine systems Major elements Potential toxic elements Longitudinal and tidal variation |
description |
Coastal ecosystems are subject to periodical changes on physico-chemical characteristics that influence the behavior of major, minor and potential toxic elements. Ria de Aveiro lagoon is a shallow and vertically homogenous estuarine system, located on the northwestern part of Portugal’s Atlantic coast (40° 38’N, 8° 45’W). It is composed of various narrow channels which converge onto a single opening to the ocean, resulting in an area with large mud flats and salt marshes. This system is subject to intensive anthropological pressure, which is the main source of the elevated levels of contaminants present within it. The objective of this work was to study the longitudinal and tidal variability of the distribution of major, minor and potential toxic elements in this well-known estuarine system with varying physico-chemical properties. The areas of study were two channels of the Ria de Aveiro estuary. Water column samples were collected from various points along the length of both channels, Mira and Ílhavo, as well as various measurements for water salinity, conductivity, temperature, pH, suspended particulate matter and dissolved oxygen. The partitioning in dissolved and particulate fractions as well, as the dispersion along both channels, were determined for Li, B, Mg, Al, K, Ca, Ti, Mn, Fe, Co, Ni, Cu, Zn, As, Sr, Ba, Hg and U. It was observed that the behavior of elements determined in one channel varied substantially in the other channel, with variations dependent on the physico-chemical parameters, as well as fresh water flow rate and proximity to anthropological pressures. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-01-01T00:00:00Z 2019 2020-03-02T20:12:39Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/27756 |
url |
http://hdl.handle.net/10773/27756 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799137660442247168 |