The Odor detection threshold is lowest concentration of a certain
odor compound that is perceivable by the human sense of
smell. The thresholds of a chemical compound is determined in part by its shape, polarity, partial charges and molecular weight. The olfactory mechanisms responsible for a compound's different detection threshold is not well understood, as such, these thresholds cannot yet be accurately predicted. Rather, they must be measured through extensive tests using human subjects in laboratory settings.
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The minimum odor of a water or air sample that can just be detected after successive dilutions with odorless water. Also called threshold odor.
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