在室内条件下对历史性纤维素酸的酸排放量进行定量研究
M Novak1, J Grau-Bové1, T Rijavec2
1UCL Institute for Sustainable Heritage, University College London, Central House, 14 Upper Woburn Pl, WC1H 0NN London, UK.
NPJ heritage science
|February 28, 2025
概括
降解纤维素酸物体会释放有害的酸,即使在理想的储存条件下. 这项研究量化了各种围中的排放量和模型度,揭示了对遗产藏品的风险.
科学领域:
- 遗产科学 遗产科学 遗产科学
- 材料科学是一种材料科学.
- 分析化学是一种分析化学.
背景情况:
- 遗产收藏中的纤维素酸物体会降解,释放出诸如酸之类的挥发性有机化合物.
- 高酸度加速了附近有机和无机材料的降解.
研究的目的:
- 为了量化从降解纤维素酸物体中排放的酸排放率.
- 模拟不同储存中的酸度,以评估对遗产藏品的风险.
主要方法:
- 微侵袭采样和离子染色学被用来测量酸排放.
- 排放率被用作各种封装中的乙酸度预测模型的输入.
主要成果:
- 一些纤维素酸物体在标准储存条件下 (20°C,30%RH) 即使在高速发出乙酸.
- 排放率取决于物体的厚度:较厚物体的内部扩散,较薄物体的表面蒸发.
- 表面涂层的档案箱显示,由于空气交换和沉积较低,酸度高于其他测试的箱体.
结论:
- 纤维素酸盐的降解对遗产收藏品造成了很大的室内污染风险.
- 了解排放动态和外性能对于减轻酸损伤至关重要.
- 目前的储存建议可能不足以防止酸的释放和积累.
相关概念视频
01:30Titration of a Weak Acid with a Strong Base
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In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...
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01:17Solution Composition During Acid/Base Titrations
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The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
The α0 and α1 values...
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