Abstract
Three microporous membrane covers of various weights and porosities were compared for their ability toimpede the transmission of odor-producing compounds released during Phase I of the mushroom substrate preparationprocess. Moist, cotton flannel 10 cm 10 cm (4 in. 4 in.) fabric swatches were used to assess the intensity of odorsabove four test piles: one with no cover and one with each of the three covers under investigation. The swatches weresuspended above each pile (by laying them on top of 10 cm diameter 10 cm long PVC pipe sections) for 1, 4, and 10 mindurations. Upon completion of each test run, five panelists were asked to sniff swatches from all piles and all exposuretimes and rate the odor intensities from zero to five, zero indicating no detectable odor and five being equivalent to theodor present on a swatch exposed to an uncovered pile for 30 minutes. Additionally, a quantitative assessment of odors,using thermal absorption and gas chromatography, was conducted and the results yielded trends which were compatiblewith those obtained qualitatively, thus validating the effectiveness of the olfactory procedure employed. Ten minuteduration test results indicated that cover A was most effective, cover C was nearly as effective, and cover B was the leasteffective, although a reduction in odor intensity was observed.
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