The Detection On Odor Threshold Of Nine Kinds Of Organic Compounds By Electronic Nose

The method of organoleptic testing can obtain the degree of stimulation that the smelly compounds gives to human olfactory organ directly. But this method would be interference by experimenters’ individual difference of olfactory organ, emotion, condition and external interference easily. As a result, Experimental conclusion has no repeatability and comparability. In order to avoid this adverse effect, we should establish one kind of objectively evaluation systems of odor detection. In addition, odorous threshold information is an important basic property of compounds and it has great significance. Therefore, in this work we use electronic nose as a testing instrument to detect nine different concentrations of organic compounds as follow: Benzene, Toluene, P-xylene, Formaldehyde, Acetaldehyde, Butyraldehyde, Methylamine, Two Methylamine and Tertiary amine. First, we should obtain the information about the most sensitive sensor signal for each organic compound, and then receive the characteristic data of each sensor signal. Finally, we calculate odor threshold of electronic nose for Benzene, Toluene, P-xylene, Formaldehyde, Acetaldehyde, Butyraldehyde, Methylamine, Two Methylamine and Tertiary amine are 0.05 ppm, 0.02 ppm, 0.005 ppm, 0.2ppm, 0.21 ppm, 0.007 ppm, 0.07 ppm, 0.014 ppm and 0.005 ppm. The results show that not only the odor thresholds of organic compounds measured objectively by the electronic nose method have consistency comparing with the ones from human olfactory organ but also the electronic nose detection has a higher sensitivity. By means of research in compounds’ aural intensity, we have laid a good foundation for quantitative analysis of odor threshold and it will has an important practical significance for the selection of chemicals in the process of the future textile and garment industry.