The aerobic biomass dies when exposed to a new environment by land application. The biomass decays anaerobically - releasing odorants similar to anaerobically digested manure. Based on Wind Tunnel Experiments in England. Scentometer A scentometer is a simple, hand-held odor dilution device used to measure odor concentration in the field. The person taking measurements holds the device up to his nose and breaths through the scentometer.
Gases can either pass directly to the nose or pass through an activated carbon filter.
The analyst chooses dilution factor by selecting the size of the hole passing unfiltered air. Advantages of the scentometer are its portabilty, its simplicity of use, and its ability to give immediate values for odor concentration and intensity. It is particularly useful for measuring intensity of odor sources. The main disadvantage is that it is difficult to overcome the analyst's personal bias in measurement. Also, the analyst's ability to distinguish odors diminishes the longer he is exposed to odors.