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Double-layer Tedlar bags: a means to limit humidity evolution of air samples and to dry humid air samples

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Abstract

Tedlar bags, which are widely used to collect air samples, especially VOCs and odorous atmospheres, can allow humidity to diffuse when relative humidity levels differ between the inside and outside. Starting with dry air inside the bag and humid air outside, we monitored equilibrium times under several conditions showing the evolution and influence of collected volumes and exposed surfaces. A double-film Tedlar bag was made, to limit the impact of external humidity on a sample at low humidity level. With the addition of a drying agent between both films, the evolution of humidity of a sample can be stopped for several hours. When a VOC mixture was monitored in a humid atmosphere, humidity was decreased but no significant evolution of VOC concentrations was observed.

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Authors and Affiliations

  1. Ecole des Mines d’Alès, LGEI, 6 Avenue de Clavières, 30319, Alès Cedex, France

    Stephane Cariou & Jean-Michel Guillot

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  1. Stephane Cariou
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  2. Jean-Michel Guillot
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Correspondence to Jean-Michel Guillot.

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Cariou, S., Guillot, JM. Double-layer Tedlar bags: a means to limit humidity evolution of air samples and to dry humid air samples. Anal Bioanal Chem 384, 468–474 (2006). https://doi.org/10.1007/s00216-005-0177-4

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  • DOI: https://doi.org/10.1007/s00216-005-0177-4

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