Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota

Detalhes bibliográficos
Autor(a) principal: Cardoso, João Pedro Pereira Azedo
Data de Publicação: 2022
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/55537
Resumo: Tese de mestrado, Ciências do Mar, 2022, Universidade de Lisboa, Faculdade de Ciências
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spelling Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biotaContaminantes orgânicosPCBsPesticidasEcotoxicologiaQuímica AmbientalTeses de mestrado - 2022Departamento de Biologia VegetalTese de mestrado, Ciências do Mar, 2022, Universidade de Lisboa, Faculdade de CiênciasThis project reports the analysis of organochloride pesticides and polychlorinated biphenyls (PCBs) compoundsin a marsh environment, to observe its toxicological effects on a marine model organism. To achieve this goal, it was quantified the concentration of organocloride pesticides and PCBs in sediments and plants, with origin in Alcochete, Rosário in Seixal estuaries. In this case, we chose to study Spartina maritima. To extract the pollutants, it was used the ASE and QuEChERS techniquesin sediments and plants samples, respectively, and the GC-ECD technique to analyze its content. With this experiment, it was possible to conclude that pesticide compounds were more predominant in Rosário, while PCBs compounds were more predominant in Seixal, derived from the activities that occurred in the vicinity of those sites. Alcochete was the less polluted site that was analysed in this work. When comparing the results obtained in this work with other concentrations from the same compounds in other Portuguese estuaries, it was possible to observe that the Tagus estuary presented a higher level of these contaminants. This is due to the higher population and activity that occurs in this zone, in comparison to other Portuguese estuaries. When studying the compounds’ concentration on plants, it was possible to observe a higher concentration on the rhizosediments. To test the toxicity of these compounds we exposed PCB 153 at 1 µg/L, 3 µg/L and 6 µg/L to the diatom model Phaeodactylum tricornutum. Afterwards, we analysed the biomarkers growth rate, photochemistry, pigment, fatty acids, lipid peroxidation and antioxidant enzyme activity of the cell. It was possible to observe that, when exposed to the compound, the cells suffered from growth inhibition, oxidative stress, and photosynthesis inhibition, such as the closure of the reaction’s centres and damage in the photosystem. This occured even though they presented counter mechanisms to the toxic effects, such as the incrementation of photosynthetic effects, such as the grouping probability, increase of efficiency of the electron transport from PQH2 to PSI, and biochemical such as the incrementation of photoprotective pigments and pigments which increase the ability to trap photons for the reductions that happen in the photosynthesis and increases the activity of antioxidant enzymes.Duarte, Bernardo Afonso de Aranha AlhandraPalma, Carla Maria Ferreira MesquitaRepositório da Universidade de LisboaCardoso, João Pedro Pereira Azedo2022-12-29T10:38:18Z202220222022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/55537enginfo: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:RCAAP2023-11-08T17:02:36Zoai:repositorio.ul.pt:10451/55537Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:06:12.175427Repositório 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 Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
title Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
spellingShingle Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
Cardoso, João Pedro Pereira Azedo
Contaminantes orgânicos
PCBs
Pesticidas
Ecotoxicologia
Química Ambiental
Teses de mestrado - 2022
Departamento de Biologia Vegetal
title_short Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
title_full Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
title_fullStr Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
title_full_unstemmed Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
title_sort Pesticides and polychlorinated biphenyls (PCBs) contamination and ecotoxicity in estuarine biota
author Cardoso, João Pedro Pereira Azedo
author_facet Cardoso, João Pedro Pereira Azedo
author_role author
dc.contributor.none.fl_str_mv Duarte, Bernardo Afonso de Aranha Alhandra
Palma, Carla Maria Ferreira Mesquita
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Cardoso, João Pedro Pereira Azedo
dc.subject.por.fl_str_mv Contaminantes orgânicos
PCBs
Pesticidas
Ecotoxicologia
Química Ambiental
Teses de mestrado - 2022
Departamento de Biologia Vegetal
topic Contaminantes orgânicos
PCBs
Pesticidas
Ecotoxicologia
Química Ambiental
Teses de mestrado - 2022
Departamento de Biologia Vegetal
description Tese de mestrado, Ciências do Mar, 2022, Universidade de Lisboa, Faculdade de Ciências
publishDate 2022
dc.date.none.fl_str_mv 2022-12-29T10:38:18Z
2022
2022
2022-01-01T00:00:00Z
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/10451/55537
url http://hdl.handle.net/10451/55537
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
instname_str 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)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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