Reducing Odour Sample Degradation: A Comparative Study of Nalophan, Tedlar® and PTFE Sample Bags

Reducing Odour Sample Degradation: A Comparative Study of Nalophan, Tedlar® and PTFE Sample Bags

Degradation is inherent part of odour sampling and olfactometery analysis. There are many techniques that can be deployed in order to minimize sample degradation, such as nitrogen-based pre-dilution and sealed transportation vessels. Despite the best efforts to keep the volatilization at bay – sample degradation has forced European and American standards to implement a thirty (30) hour expiration on all odour samples. German standard and the future EN13725 standard may go even further to propose a 6 hour limit, as observations have shown samples can degrade by an order of ten magnitude in a span of less than 24 hours. This study will aim to measure sample degradation from a variety of sources over a span of 48 hours. Samples will be stored in Nalophan, Tedlar®, and the newly introduced PTFE bags. Initial data has shown that the much higher density of PTFE provides slower sample degradation than Tedlar® or Nalophan. This is especially true of samples with high humidity, Ammonia, or H2S. To properly simulate shipping conditions a portion of the study will focus on samples that are subjected to lower pressure and temperature similar to those found in standard cargo planes. These samples will be compared to those which have been stored at standard conditions (room temperature at 1 atmosphere)

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