BURGAUD, Cédric; ROUCHON, Véronique; WATTIAUX, Alain; BLETON, Jean; SABOT, René; REFAIT, Philippe

doi:10.1016/j.jelechem.2010.09.015

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BURGAUD, Cédric
Centre de Recherche pour la Conservation des Collections [CRCC]
Laboratoire d'Etude des Matériaux en Milieux Agressifs [LEMMA]

ROUCHON, Véronique
Centre de Recherche pour la Conservation des Collections [CRCC]
Laboratoire d'Etude des Matériaux en Milieux Agressifs [LEMMA]

WATTIAUX, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of electroanalytical chemistry and interfacial electrochemistry. 2010, vol. 650, n° 1, p. 16-23

Elsevier

Résumé en anglais

Ancient iron gall ink manuscripts can be treated by immersion in water to dissolve excess iron compounds known to be involved in the degradation of such manuscripts. In this study, redox potential measurements were performed so as to follow the dissolution of iron gall inks from original degraded manuscripts over a period of time. Due to the complexity of the system, potentiometry was also applied to understand the interactions between the main components of iron gall inks, namely Fe(II) and Fe(III) sulphates, gallic acid and gum arabic. All these components were electrochemically active but the redox potential was mainly governed by the Fe(III)/Fe(II) redox couple. It could be demonstrated that one gallic acid molecule could readily reduce, in the experimental conditions considered here, up to four Fe(III) cations.< Réduire

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Potentiometry

Gallic acid

Fe(II)/Fe(III) redox system

Ancient manuscripts

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Determination of the Fe(II)/Fe(III) ratio in iron gall inks by potentiometry: a preliminary study

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Mots clés en anglais

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