| Chemical |
Ethylene |
| CAS-number : |
74-85-1 |
| |
| Synonyms : |
| ethene |
| etyleeni |
| |
| Sumformula of the chemical : |
| C2H4 |
| EINECS-number : |
| 2008153 |
| |
| Odor : |
Quality: olefinic
Hedonic tone: unpleasant to neutral
Threshold odour concentration
absolute: 260 ppm
50 % recognition: 400 ppm
100 % recognition: 700 ppm
Odour index 100 % recognition: 1 428
(Hellman & Small 1974)
|
| |
| Molecular weight : |
28.05 |
| |
| Melting point, °C : |
| -169 |
|
| |
| Boiling point, °C : |
| -103.7 |
|
| |
| Henry's law constant, Pa x m3/mol : |
| 21030 |
calc. Yaws et al. 1991 |
| |
| Photochemical degradation in air : |
Photooxidation half-life in air:
6.2hr - 56hr,
bsed upon combined, measured photooxidation rate constants for -
OH and ozone (Howard 1991).
|
| |
| Photochemical degradation in water : |
Photooxidation half-life in water:
80d - 3200d,
based upon a measured rate constant for reaction with -OH in
aqueous solution (Howard 1991).
|
| |
| Half-life in air, days : |
| 0.3 |
6.2hr - 56hr, |
| 2.3 |
based upon combined, measured photooxidation |
| |
rate constant for -OH and ozone, |
| |
Howard 1991 |
| |
| Half-life in soil, days : |
| 1 |
1d - 4w, |
| 28 |
scientific judgement based upon biological |
| |
screening tests in soil, |
| |
Howard 1991 |
| |
| Half-life in water, days : |
| 1 |
1d - 4w, |
| 28 |
in surface water, scientific judgement based upon |
| |
soil biodegradation half-lives, |
| 2 |
2d - 8w, |
| 56 |
in ground water, scientific judgement based upon |
| |
soil biodegradation half-lives, |
| |
Howard 1991 |
| |
| Aerobic degradation in water : |
Aerobic half-life:
4d - 16w,
scientific judgement based upon soil biodegradation half-lives
(Howard 1991).
|
| |
| Effects on plants : |
0.002 - 0.02 ppm (0.0023 - 0.023 mg/m3) for 24 (nonwoody plants
susceptible to ethylene) (U.S.
Environmental Protection Agency
1976).
|
References |
| 1673 | Hellman, T.M. & Small, F.H. 1974.
Characterization of the odour
properties of 101 petrochemicals using sensory methods.
J.
Air
Pollut.
Control Assoc. 24: 979 - 982. |
| 3120 | Howard, P.H., Boethling, R.S., Jarvis, W.F., Meylan, W.M. &
Michalenko, E.M., Handbook of Environmental Degradation Rates,
1991.
Lewis Publicers, Inc., Chelsea, Michigan, U.S.A.,
pp. 725.
|
| 1121 | U.S.
Environmental Protection Agency. 1976.
Diagnosing
vegetation injury caused by air pollution.
U.S.E.P.A.,
Washingron, D.C. |
| 3030 | Yaws, C., Yang, H-C. & Pan, X. 1991.
Henry's law constants for
362 organic compounds in water.
Chemical Engineering.
November.
p 179 - 185. |
