Odorous Substances

Odorous Substances (Osmogenes) and odor 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

For odor treatment and control on the above components









Lenntech BV

Rotterdamseweg 402 M
2629 HH Delft
The Netherlands

tel: +31 152 610 900

fax: +31 15 261 62 89

e-mail: info@lenntech.com











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