Abstract
The removal of non-reactive iron for different combinations of Fe2+ and tannic acid in irongall inks, via calcium phytate solutions, was studied. In parallel, the non-reactive iron removal kinetics was investigated using the pseudo first-order and second-order kinetic models. The results showed that the use of a dilute solution of calcium phytate to wash the impregnated paper strips removed the non-reactive iron from iron-gall inks in approximately 15 min in stoichiometric and non-stoichiometric combinations of iron and tannic acid. A second washing of the paper strips after an accelerated ageing, showed a distinct kinetic behaviour, with iron removal taking place simultaneously but apparently via a different mechanism. The use of a reference calcium phytate solution exhibited the same behaviour, suggesting that the use of dilute solutions as iron removal agents would represent less damage to historical documents. The results of kinetic modelling showed that all the combinations of Fe2+ and tannic acid used fitted the pseudo first-order kinetic model, when dilute and reference phytate solutions were tested as iron-desorbing agents.
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da Costa, A.C.A., do Corrêa, F.N., de Sant’Anna, G.S. et al. Kinetic study of non-reactive iron removal from iron-gall inks. Chem. Pap. 70, 602–609 (2016). https://doi.org/10.1515/chempap-2015-0227
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DOI: https://doi.org/10.1515/chempap-2015-0227