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对聚合物气体采样袋进行系统研究,以离线分析呼出的气息
Mateusz Fido1, Simone Hersberger2, Andreas T Güntner2
1Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, Zürich, Switzerland.
用于呼吸分析的聚合物采样袋含有杂质,并丢失挥发性有机化合物,特别是短链脂肪酸. 储存条件,如紫外线,显著改变样品成分,影响分析准确性.
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:
- 聚合物袋用于气体样本的储存和分析是很常见的.
- 不同的袋子材料 (Tedlar,Kynar,Teflon,Nalophan,EVOH) 在性能上有所不同.
- 了解袋子限制对于准确的呼吸分析至关重要.
研究的目的:
- 为了比较常见的聚合物袋材料来储存呼出的人类呼吸.
- 调查储存条件对挥发性有机化合物 (VOC) 度的影响.
- 用质谱测量来评估不同袋子是否适合离线分析.
主要方法:
- 对Tedlar (PVF),Kynar (PVDF),Teflon (PTFE),Nalophan (PET) 和乙烯乙烯共聚合物 (EVOH) 袋的比较分析.
- 在各种条件下 (湿度,光线) 储存排气样本长达48小时.
- 使用二次电喷离子化和质子转移反应质谱法 (PTR-MS) 分析挥发性有机物.
主要成果:
- 所有测试的袋子都显示出高的初始杂质,在48小时后,杂质翻了一番.
- 在所有袋类型中观察到短链脂肪酸 (SCFA) 的显著损失 (在8小时内超过50%).
- 紫外线辐射暴露改变了Tedlar,Nalophan和EVOH袋中的样品组成,持续了48小时.
结论:
- 聚合物采样袋含有杂质,容易受到光等环境因素的影响.
- 对SCFA的低恢复率和组成变化限制了呼吸样本存储的可靠性.
- 为了准确的呼吸分析,需要进一步开发采样和分析方法.
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