fatima araujo - Academia.edu (original) (raw)

Papers by fatima araujo

Research paper thumbnail of Tentative Approaches for Extraction of Lanthanides from Wastewater with Low Metal Concentration

Research paper thumbnail of Microstructural characterisation of a collection of Protohistoric bronzes

Microscopy and Microanalysis, Aug 1, 2013

Microstructural characterisation of an archaeological collection of Protohistoric bronze artefact... more Microstructural characterisation of an archaeological collection of Protohistoric bronze artefacts attributed to around the VIII century B.C. and has been carried out using optical microscopy (OM) and scanning electron microscopy combined with energy dispersive spectroscopy (SEM-EDS). The collection was found in Medronhal cave (Condeixa-a-Nova, Portugal) and is composed by 1 fibula, 5 bracelets and 31 rings.

Research paper thumbnail of Mineralogical and geochemical characterisation of surficial sediments from the Southwestern Iberian Continental shelf

Thalassas: an International Journal of Marine Sciences, 2005

ABSTRACT The main goal of the research being carried out, whose results are herein disclosed, is ... more ABSTRACT The main goal of the research being carried out, whose results are herein disclosed, is to contribute to the better understanding of sediment transport and deposition processes taking place in the Southwestern Iberian Continental Shelf (Gulf of Cadiz), based upon mineralogical (silt and clay fractions composition) and geochemical (rare earth elements nature and concentration) data. In the fine fraction

Research paper thumbnail of Assessment of distribution and sources of pyrogenic carbon in the lower course of the Guadiana River (SW Iberian Peninsula)

Journal of Soils and Sediments, Feb 25, 2015

Research paper thumbnail of Rare earth element distribution in sediments from the Minho river and estuary (Portugal) — a preliminary study

Chemical Geology, Jul 1, 1993

Research paper thumbnail of Geochemical tracers of northern Portuguese estuarine sediments on the shelf

Progress in Oceanography, 2002

... Finally, the distributions of rare earth elements (REE) are discussed, since they are a parti... more ... Finally, the distributions of rare earth elements (REE) are discussed, since they are a particularly interesting group of ... Factor 1: Fine sediment fraction: Al, K, Rb and transition elements. ... The tracemetal content of sediments is a consequence of not only natural weathering but also ...

Research paper thumbnail of Chalcolithic copper production and use in the western end of the Iberian Peninsula: The testimony of Castro de Chibanes (Portugal)

Journal of Archaeological Science: Reports

Research paper thumbnail of Early Iron Age copper-based funerary items from southern Portugal

Archaeological and Anthropological Sciences

The recently excavated necropolises of Esfola (Beja) and Monte do Bolor 1/2 (Beja) display a char... more The recently excavated necropolises of Esfola (Beja) and Monte do Bolor 1/2 (Beja) display a characteristic architecture and distinctive funerary items that refer to the seventh to sixth century BC. The work comprises a microanalytical study of copper-based artefacts, some of them symbols of status, recovered in these necropolises (Tartesic belt buckles, body grooming instruments and different types of fibulae, bracelets and rings). The alloy composition was determined by micro-EDXRF and micro-PIXE analyses, while the colour distinction was estimated using the composition of different alloys. These funerary items disclose a metallurgy centred in low-tin bronze alloys (7.1 ± 2.4 wt% Sn, n = 41) with minor contents of lead, arsenic, nickel and iron. There are a few exceptions composed of copper or leaded bronze (c. 3.0 wt% Sn and 2.7 wt% Pb), in addition to arsenical copper (c. 5.6–6.5 wt% As), which is particularly remarkable due to the rarity of this last alloy in coeval contexts. A Tartesic belt buckle with rivets of distinct composition from the remaining components is other exception, as most composite artefacts have components of similar composition (e.g. pin, spring and axle of fibulae and body and decoration bead of bracelets and rings). Additionally, it was assessed that only a handful of examples were perceived as having a distinct colour and these outliers were mostly small body grooming instruments. Generally, the seventh to sixth century BC funerary items of southern Portugal disclose an indigenous metallurgy altered by earlier Phoenician stimuli, but the possibility to obtain different colours by changing the alloy composition was not commonly used.

Research paper thumbnail of As Plantas, os Solos, os Metais e a Vida - Jogos Múltiplos

Boletim da Sociedade Portuguesa de Química, 1998

Dosagem de um elemento essencial Fig. 1-Curva de resposta de um organismo em função da dose de me... more Dosagem de um elemento essencial Fig. 1-Curva de resposta de um organismo em função da dose de metal a que este está exposto 121.

Research paper thumbnail of Projecto SHELLS - a utilização de conchas de Patella e Mytilus na reconstrução de paleotemperaturas da água do mar

Mudanças em Sistemas Ambientais e sua Expressão Temporal: Livro de Resumos da IX Reunião do Quaternário Ibérico, 2017, págs. 143-144, 2017

Research paper thumbnail of A metalurgia campaniforme no Sul de Portugal

Research paper thumbnail of Malhada do Vale da Água: novos dados sobre a metalurgia do Bronze Pleno do Sudoeste

Resumo A estação arqueológica Malhada do Vale da Água (Ferreira do Alentejo, Beja) foi intervenci... more Resumo A estação arqueológica Malhada do Vale da Água (Ferreira do Alentejo, Beja) foi intervencionada no âmbito dos trabalhos arqueológicos decorrentes da minimização de impactes sobre o património cultural decorrentes da execução do Bloco de Rega de Ervidel-fase de obra EDIA S.A. Os trabalhos efetuados permitiram verificar a existência de uma extensa área de construção de estruturas em negativo, localizada numa área aplanada junto do Barranco do Xacafre. Os enchimentos destas estruturas apresentavam elementos que remetem para uma longa diacronia de ocupação, tendo-se registado contextos articuláveis com a Pré-história Recente, o período Tardo-romano e a Antiguidade Tardia, o período Islâmico e a Época Moderna/Contemporânea. A ocupação pré-histórica deste sítio compreende um conjunto de fossas e um valado/ fosso, as quais apresentam, na sua maioria, uma componente artefactual articulável com a Idade do Bronze. O presente estudo centrou-se em quatro dessas fossas (Sondagens nº 3, 4, 5 e 6) devido à presença nos seus enchimentos de diversos vestígios de produção metalúrgica. Contextos com esses vestígios foram datados pelo radiocarbono como pertencentes ao final do segundo-início do terceiro quartel do segundo milénio a.C., sendo portanto enquadráveis no Bronze Pleno. Análises preliminares por espectrometria de fluorescência de raios X, dispersiva de energias (EDXRF) indicaram que os cadinhos cerâmicos, escórias, nódulos metálicos e minérios registados naquelas fossas estão associados com a produção de cobre e bronze. Os cadinhos e as escórias onde foi identificada esta liga são os vestígios mais antigos de produção local de bronze no sudoeste ibérico. A quantidade e o tamanho assinaláveis dos vestígios metalúrgicos recuperados na Malhada do Vale da Água, designadamente das escórias e cadinhos, sugerem a produção de metal numa escala mais elevada do que tem sido registado, em especial considerando a região e o período cronológico em causa.

Research paper thumbnail of Achados metálicos de cobre no Baixo Vouga (Centro-Norte de Portugal)

Este trabalho foi realizado no âmbito dos projetos Metalurgia Primitiva no Territorio Portugues –... more Este trabalho foi realizado no âmbito dos projetos Metalurgia Primitiva no Territorio Portugues – EARLYMETAL (PTDC/HIS-ARQ/110442/2008) e Paisagens da Idade do Bronze no Ocidente Peninsular (SFRH/BSAB/986/10), financiados pela Fundacao para a Ciencia e a Tecnologia (FCT), e a bolsa SFRH/BPD/73245/2010, tambem financiada pela FCT.

Research paper thumbnail of The Composition of the São Brás Copper Hoard in Relation to the Bell Beaker Metallurgy in the South‐western Iberian Peninsula

Archaeometry, 2018

A large ceramic vessel was discovered at São Brás (southern Portugal) containing a metallic hoard... more A large ceramic vessel was discovered at São Brás (southern Portugal) containing a metallic hoard from the Chalcolithic/Early Bronze Age period. These weapons and tools were characterized by microanalytical techniques as being composed of copper with varying arsenic contents (2.2 ± 1.6 wt%) and minor amounts of lead, bismuth and iron. The collection shows a clear association between daggers and copper with a higher arsenic content, which can be explained by the high status of these silvery alloys. Finally, the compositional distribution of the hoard was compared with the metallurgy of the Bell Beaker and non-Bell Beaker communities inhabiting the southwestern Iberian Peninsula.

Research paper thumbnail of Análise química não-destrutiva de dois cadinhos achados em Conimbriga

Conimbriga: Revista de Arqueologia, 1984

A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitali... more A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitalis, UC Pombalina e UC Impactum, pressupõem a aceitação plena e sem reservas dos Termos e Condições de Uso destas Bibliotecas Digitais, disponíveis em https://digitalis.uc.pt/pt-pt/termos. Conforme exposto nos referidos Termos e Condições de Uso, o descarregamento de títulos de acesso restrito requer uma licença válida de autorização devendo o utilizador aceder ao(s) documento(s) a partir de um endereço de IP da instituição detentora da supramencionada licença. Ao utilizador é apenas permitido o descarregamento para uso pessoal, pelo que o emprego do(s) título(s) descarregado(s) para outro fim, designadamente comercial, carece de autorização do respetivo autor ou editor da obra. Na medida em que todas as obras da UC Digitalis se encontram protegidas pelo Código do Direito de Autor e Direitos Conexos e demais legislação aplicável, toda a cópia, parcial ou total, deste documento, nos casos em que é legalmente admitida, deverá conter ou fazer-se acompanhar por este aviso.

Research paper thumbnail of Unravelling the antitumoral potential of novel bis(thiosemicarbazonato) Zn(II) complexes: structural and cellular studies

Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry, Jan 24, 2018

The development of pharmacologically active compounds based on bis(thiosemicarbazones) (BTSC) and... more The development of pharmacologically active compounds based on bis(thiosemicarbazones) (BTSC) and on their coordination to metal centers constitutes a promising field of research. We have recently explored this class of ligands and their Cu(II) complexes for the design of cancer theranostics agents with enhanced uptake by tumoral cells. In the present work, we expand our focus to aliphatic and aromatic BTSC Zn(II) complexes bearing piperidine/morpholine pendant arms. The new complexes ZnL-ZnL were characterized by a variety of analytical techniques, which included single-crystal X-ray crystallography for ZnL and ZnL. Taking advantage of the fluorescent properties of the aromatic complexes, we investigated their cellular uptake kinetics and subcellular localization. Furthermore, we tried to elucidate the mechanism of action of the cytotoxic effect observed in human cancer cell line models. The results show that the aliphatic complexes (ZnL and ZnL) have a symmetrical structure, while...

Research paper thumbnail of Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)

Ciencias Marinas, 2005

The present work aims to understand the origin of sediments deposited in the Galician coastal zon... more The present work aims to understand the origin of sediments deposited in the Galician coastal zone and continental shelf. Selected sediment cores were studied using different geochemical approaches: grain-size measurements, carbonate determinations and elemental analyses. Chemical analyses were carried out by multielemental techniques: energy dispersive X-ray fluorescence spectrometry (EDXRF) and instrumental neutron activation analysis (INAA). The grain-size distribution demonstrated that samples collected off the rias (Vigo and Pontevedra) contain higher percentages of silt and clay. The carbonate enrichment measured in some sediment samples with different locations and granulometries seems to indicate that the sediments might have distinct origins: biological fluvial productivity in sediments off the rias and marine biogenic activities for the deeper continental shelf sediments. Chemical analyses made it possible to distinguish different elemental sources: lithogenic, anthropogen...

Research paper thumbnail of Bromine soil/sediment enrichment in tidal salt marshes as a potential indicator of climate changes driven by solar activity: New insights from W coast Portuguese estuaries

Science of The Total Environment, 2017

Bromine soil/sediment enrichment in tidal salt marshes as a potential indicator of climate change... more Bromine soil/sediment enrichment in tidal salt marshes as a potential indicator of climate changes driven by solar activity: new insights from W coast Portuguese estuaries

Research paper thumbnail of Elemental composition of Demospongiae from the eastern Atlantic coastal waters

Chemical Speciation & Bioavailability, 1999

Research paper thumbnail of Some Long Term Corrosion Patterns in Archaeological Metal Artefacts

Materials Science Forum, 2010

Long term corrosion phenomena are generally not obtained in laboratorial corrosion experiments. P... more Long term corrosion phenomena are generally not obtained in laboratorial corrosion experiments. Particular features, such as strong intergranular corrosion, can be an indication of the antiquity of a metallic artefact. In the present study, various corrosion features from several archaeological bronze artefacts, with ages ranging from 2 to 5 millenniums, are examined using optical and scanning electron microscopies. Elemental composition was obtained through micro-EDXRF analyses. Corrosion patterns could, in some occasions, be related to specific thermomechanical treatments performed before burial and, in others, with particular phases present in the artefact.

Research paper thumbnail of Tentative Approaches for Extraction of Lanthanides from Wastewater with Low Metal Concentration

Research paper thumbnail of Microstructural characterisation of a collection of Protohistoric bronzes

Microscopy and Microanalysis, Aug 1, 2013

Microstructural characterisation of an archaeological collection of Protohistoric bronze artefact... more Microstructural characterisation of an archaeological collection of Protohistoric bronze artefacts attributed to around the VIII century B.C. and has been carried out using optical microscopy (OM) and scanning electron microscopy combined with energy dispersive spectroscopy (SEM-EDS). The collection was found in Medronhal cave (Condeixa-a-Nova, Portugal) and is composed by 1 fibula, 5 bracelets and 31 rings.

Research paper thumbnail of Mineralogical and geochemical characterisation of surficial sediments from the Southwestern Iberian Continental shelf

Thalassas: an International Journal of Marine Sciences, 2005

ABSTRACT The main goal of the research being carried out, whose results are herein disclosed, is ... more ABSTRACT The main goal of the research being carried out, whose results are herein disclosed, is to contribute to the better understanding of sediment transport and deposition processes taking place in the Southwestern Iberian Continental Shelf (Gulf of Cadiz), based upon mineralogical (silt and clay fractions composition) and geochemical (rare earth elements nature and concentration) data. In the fine fraction

Research paper thumbnail of Assessment of distribution and sources of pyrogenic carbon in the lower course of the Guadiana River (SW Iberian Peninsula)

Journal of Soils and Sediments, Feb 25, 2015

Research paper thumbnail of Rare earth element distribution in sediments from the Minho river and estuary (Portugal) — a preliminary study

Chemical Geology, Jul 1, 1993

Research paper thumbnail of Geochemical tracers of northern Portuguese estuarine sediments on the shelf

Progress in Oceanography, 2002

... Finally, the distributions of rare earth elements (REE) are discussed, since they are a parti... more ... Finally, the distributions of rare earth elements (REE) are discussed, since they are a particularly interesting group of ... Factor 1: Fine sediment fraction: Al, K, Rb and transition elements. ... The tracemetal content of sediments is a consequence of not only natural weathering but also ...

Research paper thumbnail of Chalcolithic copper production and use in the western end of the Iberian Peninsula: The testimony of Castro de Chibanes (Portugal)

Journal of Archaeological Science: Reports

Research paper thumbnail of Early Iron Age copper-based funerary items from southern Portugal

Archaeological and Anthropological Sciences

The recently excavated necropolises of Esfola (Beja) and Monte do Bolor 1/2 (Beja) display a char... more The recently excavated necropolises of Esfola (Beja) and Monte do Bolor 1/2 (Beja) display a characteristic architecture and distinctive funerary items that refer to the seventh to sixth century BC. The work comprises a microanalytical study of copper-based artefacts, some of them symbols of status, recovered in these necropolises (Tartesic belt buckles, body grooming instruments and different types of fibulae, bracelets and rings). The alloy composition was determined by micro-EDXRF and micro-PIXE analyses, while the colour distinction was estimated using the composition of different alloys. These funerary items disclose a metallurgy centred in low-tin bronze alloys (7.1 ± 2.4 wt% Sn, n = 41) with minor contents of lead, arsenic, nickel and iron. There are a few exceptions composed of copper or leaded bronze (c. 3.0 wt% Sn and 2.7 wt% Pb), in addition to arsenical copper (c. 5.6–6.5 wt% As), which is particularly remarkable due to the rarity of this last alloy in coeval contexts. A Tartesic belt buckle with rivets of distinct composition from the remaining components is other exception, as most composite artefacts have components of similar composition (e.g. pin, spring and axle of fibulae and body and decoration bead of bracelets and rings). Additionally, it was assessed that only a handful of examples were perceived as having a distinct colour and these outliers were mostly small body grooming instruments. Generally, the seventh to sixth century BC funerary items of southern Portugal disclose an indigenous metallurgy altered by earlier Phoenician stimuli, but the possibility to obtain different colours by changing the alloy composition was not commonly used.

Research paper thumbnail of As Plantas, os Solos, os Metais e a Vida - Jogos Múltiplos

Boletim da Sociedade Portuguesa de Química, 1998

Dosagem de um elemento essencial Fig. 1-Curva de resposta de um organismo em função da dose de me... more Dosagem de um elemento essencial Fig. 1-Curva de resposta de um organismo em função da dose de metal a que este está exposto 121.

Research paper thumbnail of Projecto SHELLS - a utilização de conchas de Patella e Mytilus na reconstrução de paleotemperaturas da água do mar

Mudanças em Sistemas Ambientais e sua Expressão Temporal: Livro de Resumos da IX Reunião do Quaternário Ibérico, 2017, págs. 143-144, 2017

Research paper thumbnail of A metalurgia campaniforme no Sul de Portugal

Research paper thumbnail of Malhada do Vale da Água: novos dados sobre a metalurgia do Bronze Pleno do Sudoeste

Resumo A estação arqueológica Malhada do Vale da Água (Ferreira do Alentejo, Beja) foi intervenci... more Resumo A estação arqueológica Malhada do Vale da Água (Ferreira do Alentejo, Beja) foi intervencionada no âmbito dos trabalhos arqueológicos decorrentes da minimização de impactes sobre o património cultural decorrentes da execução do Bloco de Rega de Ervidel-fase de obra EDIA S.A. Os trabalhos efetuados permitiram verificar a existência de uma extensa área de construção de estruturas em negativo, localizada numa área aplanada junto do Barranco do Xacafre. Os enchimentos destas estruturas apresentavam elementos que remetem para uma longa diacronia de ocupação, tendo-se registado contextos articuláveis com a Pré-história Recente, o período Tardo-romano e a Antiguidade Tardia, o período Islâmico e a Época Moderna/Contemporânea. A ocupação pré-histórica deste sítio compreende um conjunto de fossas e um valado/ fosso, as quais apresentam, na sua maioria, uma componente artefactual articulável com a Idade do Bronze. O presente estudo centrou-se em quatro dessas fossas (Sondagens nº 3, 4, 5 e 6) devido à presença nos seus enchimentos de diversos vestígios de produção metalúrgica. Contextos com esses vestígios foram datados pelo radiocarbono como pertencentes ao final do segundo-início do terceiro quartel do segundo milénio a.C., sendo portanto enquadráveis no Bronze Pleno. Análises preliminares por espectrometria de fluorescência de raios X, dispersiva de energias (EDXRF) indicaram que os cadinhos cerâmicos, escórias, nódulos metálicos e minérios registados naquelas fossas estão associados com a produção de cobre e bronze. Os cadinhos e as escórias onde foi identificada esta liga são os vestígios mais antigos de produção local de bronze no sudoeste ibérico. A quantidade e o tamanho assinaláveis dos vestígios metalúrgicos recuperados na Malhada do Vale da Água, designadamente das escórias e cadinhos, sugerem a produção de metal numa escala mais elevada do que tem sido registado, em especial considerando a região e o período cronológico em causa.

Research paper thumbnail of Achados metálicos de cobre no Baixo Vouga (Centro-Norte de Portugal)

Este trabalho foi realizado no âmbito dos projetos Metalurgia Primitiva no Territorio Portugues –... more Este trabalho foi realizado no âmbito dos projetos Metalurgia Primitiva no Territorio Portugues – EARLYMETAL (PTDC/HIS-ARQ/110442/2008) e Paisagens da Idade do Bronze no Ocidente Peninsular (SFRH/BSAB/986/10), financiados pela Fundacao para a Ciencia e a Tecnologia (FCT), e a bolsa SFRH/BPD/73245/2010, tambem financiada pela FCT.

Research paper thumbnail of The Composition of the São Brás Copper Hoard in Relation to the Bell Beaker Metallurgy in the South‐western Iberian Peninsula

Archaeometry, 2018

A large ceramic vessel was discovered at São Brás (southern Portugal) containing a metallic hoard... more A large ceramic vessel was discovered at São Brás (southern Portugal) containing a metallic hoard from the Chalcolithic/Early Bronze Age period. These weapons and tools were characterized by microanalytical techniques as being composed of copper with varying arsenic contents (2.2 ± 1.6 wt%) and minor amounts of lead, bismuth and iron. The collection shows a clear association between daggers and copper with a higher arsenic content, which can be explained by the high status of these silvery alloys. Finally, the compositional distribution of the hoard was compared with the metallurgy of the Bell Beaker and non-Bell Beaker communities inhabiting the southwestern Iberian Peninsula.

Research paper thumbnail of Análise química não-destrutiva de dois cadinhos achados em Conimbriga

Conimbriga: Revista de Arqueologia, 1984

A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitali... more A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitalis, UC Pombalina e UC Impactum, pressupõem a aceitação plena e sem reservas dos Termos e Condições de Uso destas Bibliotecas Digitais, disponíveis em https://digitalis.uc.pt/pt-pt/termos. Conforme exposto nos referidos Termos e Condições de Uso, o descarregamento de títulos de acesso restrito requer uma licença válida de autorização devendo o utilizador aceder ao(s) documento(s) a partir de um endereço de IP da instituição detentora da supramencionada licença. Ao utilizador é apenas permitido o descarregamento para uso pessoal, pelo que o emprego do(s) título(s) descarregado(s) para outro fim, designadamente comercial, carece de autorização do respetivo autor ou editor da obra. Na medida em que todas as obras da UC Digitalis se encontram protegidas pelo Código do Direito de Autor e Direitos Conexos e demais legislação aplicável, toda a cópia, parcial ou total, deste documento, nos casos em que é legalmente admitida, deverá conter ou fazer-se acompanhar por este aviso.

Research paper thumbnail of Unravelling the antitumoral potential of novel bis(thiosemicarbazonato) Zn(II) complexes: structural and cellular studies

Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry, Jan 24, 2018

The development of pharmacologically active compounds based on bis(thiosemicarbazones) (BTSC) and... more The development of pharmacologically active compounds based on bis(thiosemicarbazones) (BTSC) and on their coordination to metal centers constitutes a promising field of research. We have recently explored this class of ligands and their Cu(II) complexes for the design of cancer theranostics agents with enhanced uptake by tumoral cells. In the present work, we expand our focus to aliphatic and aromatic BTSC Zn(II) complexes bearing piperidine/morpholine pendant arms. The new complexes ZnL-ZnL were characterized by a variety of analytical techniques, which included single-crystal X-ray crystallography for ZnL and ZnL. Taking advantage of the fluorescent properties of the aromatic complexes, we investigated their cellular uptake kinetics and subcellular localization. Furthermore, we tried to elucidate the mechanism of action of the cytotoxic effect observed in human cancer cell line models. The results show that the aliphatic complexes (ZnL and ZnL) have a symmetrical structure, while...

Research paper thumbnail of Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)

Ciencias Marinas, 2005

The present work aims to understand the origin of sediments deposited in the Galician coastal zon... more The present work aims to understand the origin of sediments deposited in the Galician coastal zone and continental shelf. Selected sediment cores were studied using different geochemical approaches: grain-size measurements, carbonate determinations and elemental analyses. Chemical analyses were carried out by multielemental techniques: energy dispersive X-ray fluorescence spectrometry (EDXRF) and instrumental neutron activation analysis (INAA). The grain-size distribution demonstrated that samples collected off the rias (Vigo and Pontevedra) contain higher percentages of silt and clay. The carbonate enrichment measured in some sediment samples with different locations and granulometries seems to indicate that the sediments might have distinct origins: biological fluvial productivity in sediments off the rias and marine biogenic activities for the deeper continental shelf sediments. Chemical analyses made it possible to distinguish different elemental sources: lithogenic, anthropogen...

Research paper thumbnail of Bromine soil/sediment enrichment in tidal salt marshes as a potential indicator of climate changes driven by solar activity: New insights from W coast Portuguese estuaries

Science of The Total Environment, 2017

Bromine soil/sediment enrichment in tidal salt marshes as a potential indicator of climate change... more Bromine soil/sediment enrichment in tidal salt marshes as a potential indicator of climate changes driven by solar activity: new insights from W coast Portuguese estuaries

Research paper thumbnail of Elemental composition of Demospongiae from the eastern Atlantic coastal waters

Chemical Speciation & Bioavailability, 1999

Research paper thumbnail of Some Long Term Corrosion Patterns in Archaeological Metal Artefacts

Materials Science Forum, 2010

Long term corrosion phenomena are generally not obtained in laboratorial corrosion experiments. P... more Long term corrosion phenomena are generally not obtained in laboratorial corrosion experiments. Particular features, such as strong intergranular corrosion, can be an indication of the antiquity of a metallic artefact. In the present study, various corrosion features from several archaeological bronze artefacts, with ages ranging from 2 to 5 millenniums, are examined using optical and scanning electron microscopies. Elemental composition was obtained through micro-EDXRF analyses. Corrosion patterns could, in some occasions, be related to specific thermomechanical treatments performed before burial and, in others, with particular phases present in the artefact.