Summary
Non-steady state desorption of dissolved carbon dioxide gas from green Nothofagus fusca heartwoood boards saturated with carbon dioxide gas at a pressure of 1.5 MPa was used to measure transverse dissolved carbon dioxide gas diffusivities at 1, 20 and 30 °C. Mean transverse diffusion coefficients were 0.6×10-11m2s-1 at 1 °C, 4.2×10-11m2s-1 at 20 °C, and 8.4×10-11m2s-1 at 30 °C. These are 0.6, 2.5 and 3.8% of the dissolved carbon dioxide gas diffusivities in water at 1, 20 and 30 °C respectively. The activation energy of dissolved carbon dioxide gas diffusion in green N. fusca heartwood is 59. 4 kJ mol-1. This is three times the activation energy of dissolved carbon dioxide gas diffusion in water. This suggests the presence of a reaction mechanism between the dissolved carbon dioxide molecules and the cell wall constituents.
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The Forest Research Institute, Ministry of Forestry, New Zealand, supported this work by way of a postgraduate studentship.
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Jones, T.G., Walker, J.C.F. & Langrish, T.A.G. Dissolved carbon dioxide gas diffusion in green Nothofagus fusca heartwood. Wood Sci.Technol. 29, 171–176 (1995). https://doi.org/10.1007/BF00204582
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DOI: https://doi.org/10.1007/BF00204582