在被动和主动采样系统中对含有气的气态化合物进行吸附材料的物理化学性质的评估
Eka Dian Pusfitasari1, Jose Ruiz-Jimenez1, Jörgen Samuelsson2
1Department of Chemistry, PO Box 55, FI-00014, University of Helsinki, Finland; Institute for Atmospheric and Earth System Research, Chemistry, Faculty of science, PO Box 55, FI-00014, University of Helsinki, Finland.
Journal of chromatography. A
|June 4, 2023
概括
这项研究比较了固态微提取箭头 (SPME-Arrow) 和管内提取 (ITEX) 的挥发性含化合物. 吸附剂特性显著影响吸附和脱吸动力学,影响化合物的选择性.
科学领域:
- 分析化学 分析化学
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 含有挥发性的化合物是重要的空气污染物.
- 有效的采样方法对于它们的分析至关重要.
- 固相微提取箭头 (SPME-Arrow) 和管内提取 (ITEX) 是先进的采样技术.
研究的目的:
- 用SPME-Arrow和ITEX研究含有挥发性化合物的吸附和脱附行为.
- 为了比较不同SPME-Arrow涂层材料和ITEX吸附剂的选择性.
- 通过实验和理论来估计这些化合物的蒸汽压力.
主要方法:
- 使用气体染色学-质谱学进行实验调查.
- 三种SPME-Arrow涂层 (DVB/PDMS,MCM-41,MCM-41-TP) 和两个ITEX吸附剂 (TENAX-GR,MCM-41-TP) 的比较.
- 使用实验方法 (保留指数) 和理论方法 (COSMO-RS) 估计和蒸汽压力.
主要成果:
- 吸附遵循埃洛维奇模型;脱附遵循伪第一阶动力学.
- 孔体积和大小对于SPME-Arrow吸附性能至关重要;MCM-41-TP显示吸附速度最慢.
- 吸附剂和吸附剂的特性 (疏水性,基本性) 影响了动力学;在MCM-41材料上,分支氨基酸比线性氨基酸更快地被消化.
- DVB/PDMS-SPME-Arrow对氨酸和氨酸的吸附速度很快,所有化合物的吸附率都很高.
- 在ITEX上,与MCM-41-TP和TENAX-GR的吸附/脱吸率相似.
- 实验和理论估计的蒸汽压力与文学价值很好地一致.
结论:
- 吸附剂的特性,包括孔径大小和表面化学,决定了SPME-Arrow和ITEX对含化合物的效率和选择性.
- 吸附剂的选择对于优化特定挥发性含化合物的采样至关重要.
- 采用的方法准确地预测了蒸汽压力,这与大气化学建模有关,例如二次有机气溶形成.
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