Investigating the processes necessary for satisfactory freeze-drying of waterlogged archaeological wood
Investigating the processes necessary for satisfactory freeze-drying of waterlogged archaeological wood
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DOI：
10.1016/j.jas.2009.05.028
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发表时间：
2009-10-01
影响因子：
2.8
通讯作者：
Smith, Andrew D.
中科院分区：
文献类型：
--
作者：
Jones, Samuel P. P.;Slater, Nigel K. H.;Smith, Andrew D.
初步研究的方法，以改善和保护浸木文物的考古。甘露醇，山梨醇和海藻糖已被测试作为聚乙二醇（PEG）的替代品，作为木制考古物品冷冻干燥前的处理。在该短实验中，在浸泡一周后，使用20%重量/体积的山梨醇溶液实现的最高抗收缩效率为（70 +/-15）%。使用冷冻干燥显微镜测定所用每种溶液的塌陷或共晶温度。重要的是，注意到在用于处理木材样品一个月后，溶液的塌陷温度降低了几度。一种带有冷光源的冷冻干燥显微镜已被用于观察薄木材内部各种处理的实时冷冻干燥行为，证实了这种新技术确实是可能的和有用的。最后，研究了植酸镁作为铁螯合剂的作用。发现该处理使PEG 600/2000溶液的塌陷温度降低约3摄氏度，这意味着物体必须在相应较低的温度下冷冻干燥。铁K边X射线吸收近边光谱分析表明，处理提取了木材中存在的约一半的铁（III）离子。(C)2009爱思唯尔有限公司版权所有。
Preliminary studies into methods for improving and safeguarding the preservation of waterlogged archaeological wooden artefacts are presented. Mannitol, sorbitol and trehalose have been tested as replacements for polyethylene glycol (PEG) as a treatment prior to freeze-drying of wooden archaeological objects. The highest anti-shrink efficiency achieved in this short experiment was (70 +/- 15)% using a 20% weight per volume solution of sorbitol after soaking for one week. The collapse or eutectic temperature of each solution used was determined using a freeze-drying microscope. Importantly, it was noted that the collapse temperature of the solutions was reduced by several degrees after use for treatment of the wood samples for one month. A freeze-drying microscope with a cold light source has been used to observe the real-time freeze-drying behaviour of various treatments inside a thin section of wood, confirming that this novel technique is indeed possible and useful. Lastly, the effects of magnesium phytate as an iron chelator have been studied. It was found that the treatment lowers the collapse temperature of a PEG 600/2000 solution by roughly 3 degrees C meaning that objects must be freeze-dried at a correspondingly lower temperature. Iron K-edge X-ray absorption near-edge spectroscopy analysis showed that the treatment extracted approximately half of the iron(III) ions present in the timbers. (C) 2009 Elsevier Ltd. All rights reserved.