Co-Authors:
Laor, Y., Agricultural Research Organization, Newe Ya'ar Research Center, Ramat Yishay 30095, Israel
Ozer, Y., Agricultural Research Organization, Newe Ya'ar Research Center, Ramat Yishay 30095, Israel, Faculty of Engineering, Tel-Aviv University, Tel Aviv 69978, Israel
Ravid, U., Agricultural Research Organization, Newe Ya'ar Research Center, Ramat Yishay 30095, Israel
Hanan, A., Agricultural Research Organization, Newe Ya'ar Research Center, Ramat Yishay 30095, Israel
Orenstein, P., Ministry of Environmental Protection, Division of Air Quality, Jerusalem 95464, Israel
Abstract:
Odor assessments by dynamic olfactometry can be affected by odor background from sampling bags and by interactions of samples with the bag material during storage. We have conducted a methodological study which aimed to assess the odor background from new bags and the impact of sample storage in both Tediar® and Nalophan® bags -focusing on odors emitted from municipal sewage, aeration basin, sludge, livestock manure and coffee. The odor background from new non-flushed Tediar and Nalophan bags (in which fresh air was stored for 24 h) was as high as 75-317 odor units; OU (Tediar) or 36-43 (Nalophan). For pre-flushed bags the background was reduced to 25-32 (Tediar) or 19-22 (Nalophan). It suggests that although modern olfactometers allow very low dilution ratios, in practice, special caution would be needed before considering values in the range of several to low tens OU. The effect of sample storage was found to vary with different odor sources and type of bag. Storage had the greatest impact on coffee odor (both in Tediar and Nalophan) with averages losses by factors of 4-5, and for manure odor in Tediar bags with average losses by factor of around 6. Opposite effects were observed for sewage odor, with losses by factor of around 2 in Tediar but increase of odor by factors around 3 in Nalophan. The performance of the jury was monitored within actual sessions along the study period. The panel response to n-butanol was found to be fairly stable (geometric mean of 37 ppb) suggesting that the effect of storage can only be partly attributed to the uncertainty that is associated with variation among panelists. For practical reasons and before more advanced sampling methodologies are available, it is recommended that the standard will include more information about the potential impact of storage, such that labs will be able to provide a better assessment of the potential uncertainties associated with odor values and dispersion models. Copyright © 2010 AIDIC Servizi S.r.l.
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