Non-invasive pXRF technique for identifying pigments in multilayered artistic paintings

Rosario Blanc; Eloisa Manzano; José Luis Vílchez

doi:10.14568/cp41924

Autores

Rosario Blanc Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain https://orcid.org/0000-0002-7820-9133
Eloisa Manzano Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain https://orcid.org/0000-0002-4794-4661
José Luis Vílchez Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain https://orcid.org/0000-0002-1653-6390

DOI:

https://doi.org/10.14568/cp41924

Palavras-chave:

XRF portátil, Amostra padrão em multicamadas, Cinábrio, Azurite, Amarelo cádmio, Branco de chumbo

Resumo

A fluorescência de raios X portátil (pXRF) é uma ferramenta analítica poderosa; no entanto, a sua aplicação na análise de misturas complexas de pigmentos e pinturas artísticas com várias camadas − particularmente sistemas ternários e quaternários distribuídos por uma ou mais camadas − ainda apresenta desafios significativos. Este estudo investiga a eficácia da pXRF na deteção de pigmentos específicos, como azurite, vermelhão e branco de chumbo, em misturas complexas e camadas estratigráficas sobrepostas, comum em pinturas históricas e esculturas policromáticas. O amarelo de cádmio, um pigmento muito usado em períodos posteriores como sobrepintura, também foi identificado, mostrando a utilidade do pXRF para analisar obras de arte históricas, mesmo quando se trata de adições ou restauros posteriores. As informações obtidas com as réplicas experimentais foram posteriormente usadas para analisar duas pinturas históricas selecionadas como casos de estudo. Os pigmentos identificados estão distribuídos de forma heterogénea e misturados em proporções variadas.

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