Olfactory Perception Thresholds for Citral Utilizing a New Type Olfactorium

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Abstract
A new walk-in type olfactorium was constructed with all inner surfaces lined with aluminum foil and the air supply was relatively odor-free and at constant temperature and humidity. Odorant was citral which was atomized into the test chamber in varying increments of known amount. The subject sampled the test air by sniffing and the perception threshold was the smallest concentration detected. Observations (150) on 53 healthy subjects revealed the following statistically significant findings: (1) Threshold for all subjects was 0.027 [mu]g/1 air; (2) Higher acuity for females (0.017 [mu]g vs. 0.037 for males); (3) Decreased acuity in nasal obstruction (0.054 [mu]g/1 air); (4) Decreased acuity during menstrual periods; (5) Decreased acuity in subjects under stress; (6) Increased acuity during hunger. Decreased acuity often associated with nasal obstruction and/or nasal hyperemia.

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