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Electrochemical Characterization of Egyptian Blue Pigment in Wall Paintings Using the Voltammetry of Microparticles Methodology
Author(s) -
DoménechCarbó Antonio,
DoménechCarbó María Teresa,
LópezLópez Francisco,
ValleAlgarra Francisco Manuel,
OseteCortina Laura,
Haartman Estrella ArcosVon
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201300417
Subject(s) - tafel equation , pigment , voltammetry , electrochemistry , gelatin , cyclic voltammetry , materials science , ternary operation , nuclear chemistry , chemistry , electrode , organic chemistry , computer science , programming language
The solid state voltammetric response of Egypt blue, Han blue and ploss blue pigments upon attachment to graphite electrodes in contact with aqueous phosphate buffer at pH 7.0 is studied by voltammetry of microparticles and scanning electrochemical microscopy. Such voltammetric responses, combined with those for synthetic specimens consisting of binary mixtures of the pigment and SiO 2 or CaCO 3 as well as ternary ones of CaCO 3 and SiO 2 mixtures allow for the identification of the pigment and the support in samples from wall paintings using different electrochemical parameters, in particular upon performing the Tafel and modified Tafel analysis of voltammetric peaks. Identification of Egypt blue in microsamples of murals from a Roman archaeological site in Castulo (Jaén, Spain) is discussed.