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Thermal analysis of carbonate pigments and linseed oil to optimize CO2 extraction for radiocarbon dating of lead white paintings
- Source :
- Microchemical Journal, Microchemical Journal, Elsevier, 2020, 154, pp.104637. ⟨10.1016/j.microc.2020.104637⟩, Microchemical Journal, 2020, 154, pp.104637. ⟨10.1016/j.microc.2020.104637⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- International audience; Lead white was a white pigment extensively used in paintings from Antiquity until the beginning of the 20th century. It is composed of hydrocerussite (Pb3(CO3)2(OH)2) and cerussite (PbCO3). Historical recipes report metallic lead, vinegar and horse manure as ingredients to produce the two lead carbonates. The incorporation of organic CO2 carrying 14C representative of the time of manufacture of lead white allows radiocarbon dating of this pigment. One possible protocol for lead white paint preparation for dating is based on the extraction of carbon from lead carbonates by thermal decomposition. Since lead white paints are mixed with a binder and other pigments, a thermogravimetric study was implemented to study CO2 extraction from each component. The measurements were carried out on samples of modern paints prepared with lead white (lead carbonate), Meudon white (calcium carbonate) and linseed oil. The results show that it is possible to separate the carbon of interest (carrying the 14C signature: lead white and linseed oil) from the dead carbon coming from geological carbonates (containing no radiocarbon: Meudon white) by heating the paint sample at 400 °C. This study provides a better understanding of the thermal behavior of these three paint constituents and confirms the validity of the thermal protocol for the preparation of lead white paints for radiocarbon dating.
- Subjects :
- Thermogravimetric analysis
food.ingredient
chemistry.chemical_element
Mineralogy
02 engineering and technology
01 natural sciences
Analytical Chemistry
law.invention
chemistry.chemical_compound
food
Linseed oil
law
Radiocarbon dating
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Spectroscopy
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
010401 analytical chemistry
Lead carbonate
Extraction (chemistry)
021001 nanoscience & nanotechnology
humanities
0104 chemical sciences
Calcium carbonate
chemistry
Carbonate
Environmental science
0210 nano-technology
Carbon
Subjects
Details
- Language :
- English
- ISSN :
- 0026265X and 10959149
- Database :
- OpenAIRE
- Journal :
- Microchemical Journal, Microchemical Journal, Elsevier, 2020, 154, pp.104637. ⟨10.1016/j.microc.2020.104637⟩, Microchemical Journal, 2020, 154, pp.104637. ⟨10.1016/j.microc.2020.104637⟩
- Accession number :
- edsair.doi.dedup.....af5edfbfde29db8ffde908ad6a5a165c