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Diffusion of D_2O in Archaeological Wood Measured by 1-D NMR Profiles

机译：通过一维NMR谱测量D_2O在考古木材中的扩散

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摘要

1-D ~1H nuclear magnetic resonance profiles have been used to image the penetration of D_2O into waterlogged archaeological wood. A series of well characterised plugs were sampled from different depths. reflecting different degrees of degradation and orientation with respect to the wood structure, of an oak timber from the Mary Rose. The ingress of D_2O was Fickian in character and the diffusion coefficients, D, are reported as a function of depth into the timber for each orientation. The behaviour of D could be approximated by a surface layer, with a higher diffusion coefficient, and a lower diffusion core region. The differences in the values of D in the different orientations are rationalised in terms of the known structure of decayed wood. Theoretical uptake curves were calculated from a numerical evaluation of the analytical solution for diffusion into a multiple-layer model. Saturation of the surface layer was predicted to occur prior to diffusion into the core, with a characteristic change of gradient displayed in the uptake curve. Good agreement was achieved with experiments that sampled the different decay environments. Concentration distributions, and uptake curves, were calculated using these models for a typical archaeological timber.
机译：1-D〜1H核磁共振谱已用于成像D_2O渗透到浸水的考古木材中。从不同深度对一系列特征明确的塞子进行了采样。反映出玛丽·罗斯（Mary Rose）的橡木木材相对于木材结构的不同程度的降解和取向。 D_2O的进入具有Fickian特征，并且扩散系数D被报告为每个方向上木材深度的函数。 D的行为可以通过具有较高扩散系数和较低扩散核心区域的表面层来近似。 D值在不同方向上的差异根据已知的朽木结构合理化。理论吸收曲线是根据对扩散到多层模型的分析溶液的数值评估计算得出的。预测表面层会在扩散到岩心之前发生饱和，并且在吸收曲线中会显示出梯度的特征变化。通过对不同衰减环境进行采样的实验获得了良好的一致性。使用这些模型计算出典型考古木材的浓度分布和吸收曲线。

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