Common Odorous Substances and their thresholds

Common Odorous Substances and their thresholds

Common Odorous Substances and their thresholds

Formula Characteristic Odour Odour Threshold (ppm) Recognition Threshold Molecular Weight
Acetaldehyde CH3·CHO pungent, fruity 0.004 0.21 44.05
Allyl mercaptan CH2·CH·CH2·SH strong garlic, coffee 0.0005 74.15
Ammonia NH3 sharp, pungent 0.037 46.8 17.03
Amyl mercaptan CH3·(CH2)3·CH2·SH unpleasant, putrid 0.0003 104.22
Benzyl mercaptan C6H5·CH2·SH unpleasant, strong 0.00019 124.21
Butylamine C2H5·CH2·CH2·NH2 sour, ammonia-like 0.24 73.14
Cadaverine H2N·(CH2)5·NH2 putrid, decaying flesh 102.18
Chlorine Cl2 pungent, suffocating 0.01 0.314 70.91
Chlorophenol ClC6H5O medicinal, phenolic 0.00018 128.55
Crotyl mercaptan CH3·CH:CH·CH2·S skunk-like 0.000029 90.19
Dibutylamine (C4H9)2NH fishy 0.016 129.25
Diisopropylamine (C3H7)2NH fishy 0.0035 0.085 101.19
Dimethylamine (CH3)2NH putrid, fishy 0.047 0.047 45.08
Dimethyl sulfide (CH3)2S decayed vegetables 0.001 0.001 62.13
Diphenyl sulfide (C6H5)2S unpleasant 0.000048 0.0021 186.28
Ethylamine C2H5·NH2 ammoniacal 0.83 0.83 45.08
Ethyl mercaptan C2H5·SH decayed cabbage 0.00019 0.001 62.1
Hydrogen sulfide H2S rotten eggs 0.00047 0.0047 34.1
Indole C2H6NH2 recal, nauseating 117.15
Methylamine CH3NH2 putrid, fishy 0.021 0.021 31.05
Methyl mercaptan CH3SH decayed cabbage 0.0011 0.0021 48.1
Ozone O3 irritating above 2 ppm 0.001 48
Propyl mercaptan CH3·CH2·CH2·SH unpleasant 0.000075 76.16
Putrescine NH2(CH2)4NH2 putrid, nauseating 88.15
Pyridine C6H5N disagreeable, irritating 0.0037 79.1
Skatole C9H9N fecal, nauseating 0.0012 0.47 131.2
Sulfur dioxide SO2 pungent, irritating 0.009 64.07
Tert-butyl (CH3)3C·SH skunk, unpleasant 0.00008 90.19
Thiocresol CH3·C6·H4·SH skunk, rancid 0.0001 124.21
Thiophenol C6H5SH putrid, garlic-like 0.000026 0.28 110.18
Triethylamine (S2H5)3N ammoniacal, fishy 0.08 101.19

 

Scentroid