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XAS studies of the effectiveness of iron chelating treatments of Mary Rose timbers

DOI: 10.1088/1742-6596/190/1/012147 DOI Help

Authors: A. Smith (STFC, Daresbury Laboratory,) , A M. Jones (Mary Rose Trust) , E. J. Schofield (University of Kent) , J. F. W. Mosselmans (Diamond Light Source) , A. V. Chadwick (University of Kent) , A. Berko (University of Kent) , A. D. Smith (STFC Daresbury Laboratory)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: 14th International conference on X-ray absorption fine structure (XAFS14)
Peer Reviewed: Yes

State: Published (Approved)
Published: October 2009

Open Access Open Access

Abstract: The oxidation of sulfur in marine archaeological timbers under museum storage conditions is a recently identified problem, particularly for major artefacts such as historic ships excavated from the seabed. Recent work on the Vasa has stressed the role of iron in catalysing the oxidative degradation of the wood cellulose and the polyethylene glycols used to restore mechanical integrity to the timbers. In developing new treatment protocols for the long term preservation of Henry VIII of England's flagship, the Mary Rose, we are investigating the potential of chelating agents to neutralise and remove the iron products from the ships timbers. We have explored the use of aqueous solutions of chelating agents of calcium phytate, ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) and ammonium citrate to extract the iron compounds. All of these solutions exhibit some level of iron removal; however the key is to find the most effective concentration at pH of around 7 of the reagent solution, to minimise the treatment time and find the most cost-effective treatment for the whole of the Mary Rose hull. Fe K-edge XAFS data from samples of Mary Rose timbers, before and after treatment by the chelating agents mentioned has been collected. The data collected provide valuable insights into the effectiveness of the treatment solutions.

Journal Keywords: Absorption Spectroscopy; Aqueous Solutions; Calcium; Cellulose; Citrates; Cultural Objects; Dtpa; Edta; Fine Structure; Iron; Iron Compounds; Oxidation; Ph Value; Polyethylene Glycols; Removal; Wood; X-Ray Spectroscopy

Diamond Keywords: Archeology

Subject Areas: Archaeological and Cultural Heritage, Chemistry, Materials

Facility: SRS

Added On: 21/04/2010 07:38


Discipline Tags:

Cultural Heritage Humanities Chemistry Materials Science

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