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Oxygen consumption by conserved archaeological wood.

Martin N Mortensen1, Henning Matthiesen

  • 1The National Museum of Denmark, Department of Conservation, Lyngby, Denmark. martin.mortensen@natmus.dk

Analytical and Bioanalytical Chemistry
|May 30, 2013
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Summary

Archaeological wood, even after conservation, continues to degrade in museum environments. Ongoing oxygen consumption indicates a slow but persistent chemical breakdown of these valuable historical artifacts.

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Area of Science:

  • Materials Science
  • Archaeometry
  • Environmental Science

Background:

  • Waterlogged archaeological wood requires conservation for preservation.
  • Museum environments aim to stabilize artifacts but may not halt all degradation processes.

Purpose of the Study:

  • To quantify the rate of oxygen consumption in conserved archaeological wood.
  • To determine if degradation continues in a controlled museum climate.

Main Methods:

  • Oxygen consumption rates were measured over extended periods.
  • Samples included conserved wood from historical shipwrecks (Vasa, Skuldelev) and fresh wood.
  • Measurements were conducted at 50% relative humidity and room temperature.

Main Results:

  • Most conserved wood samples exhibited low but persistent oxygen consumption rates (approx. 1 μg O2 (g wood)(-1) day(-1)).
  • This oxygen consumption, indicative of degradation, was observed for several years.
  • Fresh wood samples also showed oxygen consumption, as expected.

Conclusions:

  • Waterlogged archaeological wood continues to degrade chemically even after conservation treatments.
  • Museum climate conditions, while controlled, permit ongoing degradation processes in wood artifacts.
  • The study demonstrates the need for continued monitoring and potential re-evaluation of conservation strategies for waterlogged wood.