Polydimethylsiloxane PDMS, polyethylene PE (the most used polymer in food packaging) and pectin (biopolymer potentially used as wound dressing material and in food packaging) were characterised in terms of their gas transport properties. This characterisation was performed by on-line mass-spectrometry, MS, with the upstream and downstream compartments of the membrane unit at atmospheric pressure, in order to mimic the operating conditions of the applications addressed. A simple, direct restriction was used for allowing the downstream gas mixture to reach the mass spectrometer detector. Monitoring of gas permeation by on-line mass spectrometry proved to be a highly precise and reproducible technique, which makes possible the study of multicomponent gas mixtures in dry and humidified gas conditions, without requiring sampling and additional off-line procedures and analysis. Data acquisition, with time intervals as short as one second, makes possible the comparative study of permeation processes of each gas present in different feed streams (pure gases, gas mixtures under dry and humidified conditions) during the initial transient period, allowing for inferring about solute-membrane interactions. Information about steady-state transport may also be acquired, and are in agreement with values reported in literature.

聚二甲基硅氧烷PDMS，聚乙烯PE（在食品包装中最常用的聚合物）和果胶（可能用作伤口敷料和食品包装的生物聚合物）的气体传输特性得到了表征。该表征通过在线质谱仪MS进行，膜单元的上游和下游隔室处于大气压下，以模拟所涉及应用的操作条件。简单，直接的限制条件用于允许下游气体混合物到达质谱仪检测器。事实证明，通过在线质谱监测气体渗透是一种高度精确且可重复的技术，这使得在干燥和加湿的气体条件下研究多组分气体混合物成为可能，无需采样以及其他离线程序和分析。时间间隔短至一秒的数据采集，使得在初始过渡期间比较研究不同进料流（纯气体，干燥和加湿条件下的气体混合物）中每种气体的渗透过程成为可能，从而可以推断出溶质-膜相互作用。也可以获取有关稳态运输的信息，并与文献中报道的值一致。允许推断溶质-膜相互作用。也可以获取有关稳态运输的信息，并与文献中报道的值一致。允许推断溶质-膜相互作用。也可以获取有关稳态运输的信息，并与文献中报道的值一致。