Electrochemical analysis of metallic heritage artefacts: voltammetry of microparticles (VMP)

Doménech‐Carbó, A.

doi:10.1533/9781782421573.2.165

Cited by 5 publications

(3 citation statements)

References 118 publications

(139 reference statements)

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“…The study of archaeological metal objects presents considerable difficulties due to their great diversity in composition, microstructure and corrosion conditions, which are related to many different factors such as the chemical composition of the object itself and the context in which it was found, i. e. aerobic or anaerobic conditions, soil, (salt)water, and more. [1] Obtaining chronological information on archaeological metals with a higher precision than provided by archaeological typological classification or the study of the archaeological context is an important analytical goal. [2] This is usually achieved by dating associated organic matter, if available, via radiocarbon methods, and/or associated ceramic materials by thermoluminescence, obsidian hydration, and rehydroxylation methods.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Approximation to Bronze Age Chronology via Multiple Scan Voltammetry

Doménech‐Carbó,

Mödlinger,

Osete‐Cortina

et al. 2023

ChemElectroChem

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Insert A multiple‐scan voltammetry strategy is described and applied to a set of 107 Bronze Age and later copper/bronze objects, mainly from sites in Central Europe. This methodology allows the study of the compositional and textural properties (compactness, crystallinity, degree of hydration) of the patina to be studied from the accumulated peak current values for the characteristic signals corresponding to the reduction of cuprite and tenorite to metallic copper. A new model for the relationship between peak current and the depth reached in successive scans is presented and used to discriminate samples of different provenance and manufacturing technique, as well as their ascription to different Bronze Age periods

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Section: Introductionmentioning

confidence: 99%

Electrochemical Approximation to Bronze Age Chronology via Multiple Scan Voltammetry

Doménech‐Carbó,

Mödlinger,

Osete‐Cortina

et al. 2023

ChemElectroChem

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“…Their surface features and inscriptions were obscured and distorted to such an extent that no detail of the original surface could be retrieved. Most ancient coins are subjected to various corrosion processes [29], resulting in the formation of different corrosion products [30]. Corrosion can gradually alter their aspect, shape, and nature, up to a stage where it is impossible to use them as historical evidence of human civilizations [31].…”

Section: The Study Objectsmentioning

confidence: 99%

Characterization of Excavated Silver Alloy (Billon) Coins from Amheida, Dakhla Oasis, Egypt

El-Gohary¹,

Rifai²,

Hussein³

2023

Preprint

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The importance of understanding the corrosion mechanisms of excavated metal artefacts help in determining the physico-chemical parameters of the burial environment and the formation of different corrosion products. These products can be observed and analysed with the help of various techniques that provide information on their morphology, chemical composition and structure. The analysis of ancient coins is extremely challenging in the presence of heavily corroded surfaces; as quantitative information may not exactly concur with its bulk composition. In the case of silver coins, the use of surface information can be used as a guide for bulk composition only. The current study carries out investigation and characterization of selected coins from a large coin hoard excavated from Amheida, Dakhla oasis, Egypt. The study and analysis of the alloy composition and corrosion products was performed using a multi-technique approach which included Light optical microscopes, Scanning Electron microscope (SEM) coupled with energy dispersive spectroscopy (EDS) and X-ray diffraction analysis. Investigation of the coins revealed the presence of a thick active inhomogeneous corrosion crust, while analysis showed that the coins were made from a binary silver copper alloy (billon) while the corrosion crust was rich in chlorides and carbonates, later identified by XRD analysis as Paratacamite, Malachite and Chrysocolla.

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“…What has been reported in the literature, however, is that silver can present peak splitting at +0.20 V (attributed to the oxidation of silver to Ag(I)) [45] and +0.45 V (attributed to the oxidation of silver to silver acetate) [45]. Other works show just one peak for the oxidation of silver, at +0.30 V [42], +0.44 V [84] or +0.50 V [85]. The oxidation of copper (+0.14 V), coincident with the standard potential for the pair Cu/Cu(II) [83], has been previously observed at +0.20 V [23,50] or 0.00 V [45,54,84].…”

Section: E) Hclmentioning

confidence: 82%

Uso da voltametria de micropartículas (VMP) para identificação de elementos metálicos presentes em produtos de corrosão e pigmentos.

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Electrochemical analysis of metallic heritage artefacts: voltammetry of microparticles (VMP)

Cited by 5 publications

References 118 publications

Electrochemical Approximation to Bronze Age Chronology via Multiple Scan Voltammetry

Electrochemical Approximation to Bronze Age Chronology via Multiple Scan Voltammetry

Characterization of Excavated Silver Alloy (Billon) Coins from Amheida, Dakhla Oasis, Egypt

Uso da voltametria de micropartículas (VMP) para identificação de elementos metálicos presentes em produtos de corrosão e pigmentos.

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