본문
Odor refers to an unpleasant smell that irritates the minds and nervous system of people to the extent that it will damage their emotional life and health.Also, odor is defined as different smells that give displeasure and disgust to people by irritating the olfactory sense,and they include gas substances such as hydrogen sulfide, mercaptans, amines, and other irritating gases.According to the classification, odor is something that results in an extreme level of displeasure and disgust to the extent that people cannot enjoytheirdailylife; and is generally considered as a low concentration gas mixture comprised of many different elements.Among the odor causing substances, a total of 22 odor substances are specifically classified as legally regulated substances which include ammonia, methyl mercaptan, hydrogen sulfide, methyl sulfide, dimethyl disulfide, trimethylamine, acetaldehyde, styrene, etc.
Characteristicsofdifferentoffensive odor substances
| Compound | Odor characteristics | Odor causing substances |
|---|---|---|
| Sulfuric compounds | Smell of rotten onion and cabbage | Methyl mercaptan (CH3SH), Dimethyl sulfide [(CH3)2S], Dimethyl disulfide (CH3SSCH3), etc. |
| Smell of putrid egg | Hydrogen sulfide (H2S), etc. | |
| Nitrogen compounds | Smell of manure | Ammonia (NH3), Ethylamine (CH3CH2NH2), etc. |
| Smell of rotten fish | Methylamine (CH3NH2), Trimethylamine [(CH3)3N], etc. | |
| Aldehydes | Pungent, sour, and burning scent |
Acetaldehyde (CH3CHO), Propionaldehyde (CH3CH2CHO), n-butyraldehyde [(CH3)2CHCHO], i- butyraldehyde[(CH3)2CHCHO], n-valeraldehyde [CH3(CH2)3CHO],i- valeraldehyde[(CH3)2CHCH2CHO], etc. |
| Hydrocarbons | Pungent acidic scent | Ethyl acetate(CHCO2C2H5), Methyl isobutyl ketone [CH3COCH2CH(CH3)2], etc. |
| Smell of gasoline | Ethyl acetate (CH3CO2C2H5), 4-Methyl-2-pentanone[CH3COCH(CH3)2], etc. |
|
| Fatty acids | Pungent acidic scent | Propanoic acid (CH3CH2COOH), etc. |
| Smell of sweat | Butanoic acid [CH3(CH2)2COOH], etc. | |
| Smell of a wet shoe | Valeric acid [CH3(CH2)3COOH], Isovaleric acid [(CH3)2CHCH2COOH], etc. |
|
| Halogens | Pungent and irritating scent | Chlorine, Fluorine, etc. |