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Attenuated total reflectance microspectroscopy mapping for the characterisation of bronze corrosion products

Rocco Mazzeo and Edith Joseph
Attenuated total reflectance microspectroscopy mapping for the characterisation of bronze corrosion products (in Mineral surface reactivity, Gilberto Artioli and Pierfranco Lattanzi)
European Journal of Mineralogy (May 2007) 19 (3): 363-371

Abstract

Samples collected from an archaeological object and an outdoor bronze monument as well as a bronze coupon naturally aged in an outdoor marine environment have been analysed in order to determine the composition of the corrosion and deposition compounds and map their stratigraphic distribution. Cross-sectioned samples and the bronze coupon have been placed onto the x-y-z motorized stage under the objective of an FTIR microscope and both punctual analysis and mapping of small areas was performed in ATR mode. The combination of visible light microscopy, which allows the microphotograph documentation of chemically heterogeneous samples, with FTIR-ATR mapping, is of the outmost importance in the characterisation of the corrosion features and behaviour of a wide variety of corroded bronze samples streamlining the selection of the most appropriate conservation materials and cleaning procedures to be adopted by conservators. Limitations, such as the spatial resolution of about 20 mu m and silicon crystal opacity, are compared with the great advantage of obtaining distribution false colour plots of the different compounds. As non-destructive of the sample analytical technique ATR mapping can further be combined with other analytical techniques such as metallography, X-ray EDS and Raman spectroscopy. The limitation of the ATR technique in identifying important corrosion products, which do not absorb in the mid infrared, and the need to be combined with other type of analysis is also highlighted.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 19
Serial Issue: 3
Title: Attenuated total reflectance microspectroscopy mapping for the characterisation of bronze corrosion products
Title: Mineral surface reactivity
Author(s): Mazzeo, RoccoJoseph, Edith
Author(s): Artioli, Gilberto
Author(s): Lattanzi, Pierfranco
Affiliation: University of Bologna, Microchemistry and Microscopy Art Diagnostic Laboratory, Bologna, Italy
Affiliation: Universita di Padova, Padua, Italy
Pages: 363-371
Published: 200705
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 15
Accession Number: 2007-075957
Categories: General geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universita di Cagliari, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200735
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