EDXRF and multivariate statistical analysis of fragments from Marajoara ceramics

Freitas, Renato Pereira de; Calza, C.; Lima, Tânia Andrade; Rabello, Angela; Lopes, Ricardo Tadeu

doi:10.1002/xrs.1200

Cited by 29 publications

(18 citation statements)

References 9 publications

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“…The study aims at verifying if a correct classification is possible even if the quantitative determination of minor and trace elements is abandoned, allowing a faster response when a large amount of data is concerned [12]. To this aim, weight concentration was determined from laboratory XRF measurements only while entire spectra were considered for the in situ campaign.…”

Section: Comparison Between Quantitative Xrf Analysis and Portable Xrmentioning

confidence: 99%

ED-XRF analysis for Cultural Heritage: is quantitative evaluation always essential?

Bonizzoni

2015

J. Phys.: Conf. Ser.

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Abstract. Energy Dispersive X-Ray Fluorescence (ED-XRF) is a very suitable tool for examination of CulturalHeritage materials because of its simplicity, with no requirement for any sample preparation and the possibility of operating with portable instruments, and it can probably be considered the most useful non-destructive analytical technique for ancient valuable objects of archaeological, historical or artistic interest. As regards the possibility of getting quantitative analysis in archaeometric applications, the problems arising from the limited sensitivity in detecting low Z elements, the irregular shape or the non-homogeneous composition of the sample have generated a widespread opinion that only semi-quantitative analyses are possible in XRF applications to archaeometry. In fact, this is always true for non-homogeneous samples as, typically, painting layers. On the contrary, the problems deriving from limited sensitivity in detecting matrix light elements as well as from irregular surface under analysis can be solved in most cases. Notwithstanding, working on unique and not standardized objects requires to pay attention on details and to know how to choose correct parameters and calculation algorithms to obtain reliable results. Indeed opportunities to deal with these objects are very limited and results have implication in other fields, so that each information about materials and production technique is of great interest. Two typical materials of archaeological interest showing particular features are considered -namely high corroded metallic artefacts and ceramics -revealing that, even if in cultural heritage field detailed quantitative analysis is the goal, it is not always necessary as also qualitative information by XRF spectra increase the knowledge of artefact.

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Section: Comparison Between Quantitative Xrf Analysis and Portable Xrmentioning

confidence: 99%

ED-XRF analysis for Cultural Heritage: is quantitative evaluation always essential?

Bonizzoni

2015

J. Phys.: Conf. Ser.

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“…Para cada amostra, foi calculada a média das contagens obtidas para cada um dos 2.048 canais, nos cinco pontos analisados, sendo tais valores inseridos em uma planilha e utilizados para o tratamento de dados. Essa metodologia específica -utilizando as contagens em todo o espectro ao invés das concentrações calculadas para cada elemento químico presente nas amostras -foi empregada com sucesso em outros trabalhos envolvendo o estudo de cerâmicas arqueológicas (Calza et al, 2007;Freitas et al, 2010).…”

Section: Estatística Multivariadaunclassified

“…A mesma metodologia descrita neste artigo foi anteriormente aplicada em outros artefatos cerâmicos (fragmentos e tangas de cerâmica marajoara) pertencentes ao acervo do Museu Nacional/UFRJ (Calza et al, 2007;Freitas, 2009;Freitas et al, 2010). Tais análises foram realizadas para se obter informações que pudessem auxiliar no estudo e na caracterização desses objetos.…”

Section: Potencial Da Metodologia De Análiseunclassified

“…Seu objetivo consiste em obter informações sobre a composição química, a tecnologia de fabrico, o período histórico e o estado de conservação dos artefatos. Diversos trabalhos têm abordado a questão do estudo e da caracterização de artefatos cerâmicos, utilizando as mais variadas técnicas de análise: Latini et al (2001); Zhu et al (2004); Papachristodoulou et al (2006); Romano et al (2006); Calza et al (2007); Papadopoulou et al (2007); Charalambous et al (2010); Freitas et al (2010); Andaloro et al (2011); Lima et al (2011), entre outros. Entre as técnicas de análise mais utilizadas para este propósito, destacamse: Fluorescência de Raios X (X-Ray Fluorescence -XRF), Difração de Raios X (X-Ray Diffraction -XRD), Emissão de Raios X Induzida por Partículas (Particle Induced X-Ray Emission -PIXE), Espectroscopia Raman, Espectroscopia no Infravermelho com Transformada de Fourier (Fourier Transform Infrared -FTIR), Microscopia Eletrônica de Varredura com Espectroscopia por Dispersão em Energia (Scanning Electron MicroscopyEnergy Dispersive Spectroscopy -SEM-EDS), Análise por Ativação Neutrônica (Neutron Activation Analysis -NAA), Radiografia Digital e Tomografia Computadorizada.…”

Section: Introdução: Análise Físico-química De Artefatos Cerâmicosunclassified

“…Com base nos resultados obtidos para o presente trabalho, bem como naqueles já relatados em publicações anteriores (Calza et al, 2007;Freitas et al, 2010), é proposta uma metodologia de análise para artefatos cerâmicos que permita auxiliar não somente na caracterização dos mesmos, como ainda fornecer suporte para a construção de interpretações concernentes à produção e à utilização desses objetos. Coelho (2012).…”

Section: Introdução: Análise Físico-química De Artefatos Cerâmicosunclassified

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Análise de peroleiras e cachimbos cerâmicos provenientes de escavações arqueológicas

Calza

Oliveira

Carvalho

et al. 2013

Bol. Mus. Para. Emílio Goeldi. Ciênc. hum.

Self Cite

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Este artigo apresenta os resultados da análise de fragmentos de peroleiras e cachimbos cerâmicos, oriundos de escavações arqueológicas realizadas na região compreendida entre os rios Macacu e Caceribu, no estado do Rio de Janeiro, utilizando as técnicas de Fluorescência de Raios X (XRF), Microscopia Eletrônica de Varredura, com Espectroscopia por Dispersão em Energia (SEM-EDS) e estatística multivariada. Algumas peroleiras provenientes do naufrágio do galeão Santíssimo Sacramento, que ocorreu no litoral da Bahia em 1688, foram igualmente analisadas, e os resultados comparados com aqueles obtidos para os fragmentos encontrados no Rio de Janeiro. Nesse contexto, é proposta uma metodologia de análise para artefatos cerâmicos que possa auxiliar não somente a sua caracterização, como também fornecer suporte para a construção de interpretações concernentes à produção e à utilização desses objetos.

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Chemical analysis of very small‐sized samples by wavelength‐dispersive X‐ray fluorescence

et al. 2012

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The chemical characterisation of very small‐sized samples is often of major interest in forensic analysis, studies of artworks, particulate matter on filters, raw materials impurities, and so on, although it generally poses considerable problems owing to the difficulty of obtaining precise and accurate results. This study was undertaken to develop a set of methods for the chemical characterisation of very small‐sized samples by wavelength‐dispersive X‐ray fluorescence. To conduct the study, sample preparation (as beads and pellets) and measurement conditions were optimised to reach the necessary detection and quantification limits and to obtain the appropriate measurement uncertainty for characterising the types of materials involved. The measurements were validated by using reference materials. Three test methods were developed. In two methods, the samples were prepared in the form of beads (one method being for geological materials and the other for the analysis of nongeological materials such as particulate matter on filters, glasses, frits, and ceramic glazes and pigments). In the third method, the samples were prepared in the form of pellets for the analysis of volatile elements in geological materials. In the three methods, detection limits, quantification limits and measurement uncertainties were obtained similar to those found when a bead or pellet is prepared by the usual methods from 0.5 g sample. However, in this study, sample size was between 30 and 40 times smaller in the case of beads and 100 times smaller in the case of pellets, thus broadening the range of possible wavelength‐dispersive X‐ray fluorescence applications in the chemical characterisation of materials. Copyright © 2012 John Wiley & Sons, Ltd.

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EDXRF and multivariate statistical analysis of fragments from Marajoara ceramics

Cited by 29 publications

References 9 publications

ED-XRF analysis for Cultural Heritage: is quantitative evaluation always essential?

ED-XRF analysis for Cultural Heritage: is quantitative evaluation always essential?

Análise de peroleiras e cachimbos cerâmicos provenientes de escavações arqueológicas

Chemical analysis of very small‐sized samples by wavelength‐dispersive X‐ray fluorescence

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