| Chemical |
tert-Amyl methyl ether |
| CAS-number : |
994-05-8 |
| |
| Synonyms : |
| 2-methoxy-2-methylbutane |
| Butane, 2-methoxy-2-methyl- |
| methyl tert-pentyl ether |
| TAME |
| |
| Sumformula of the chemical : |
| C6H14O
C6H14O |
| EINECS-number : |
| 2136114 |
| |
| State and appearance : |
Volatile liquid.
|
| |
| Odor : |
Strong ether-like odor.
|
| |
| Molecular weight : |
102.18 |
| |
| Density, kg/m3 : |
| 770 |
at 20 °C, Huttunen 1996 |
| 775 |
at 15 °C, Huttunen et al. 1997 |
| |
| Vapor pressure, mmHg : |
| 127.5 |
at 37.8 °C, Huttunen 1996 |
| 67.5 |
at 20 °C, Huttunen et al. 1997 |
| 157.5 |
at 37.8 °C, Huttunen et al. 1997 |
| |
| Water solubility, mg/l : |
| 11000 |
at 20 °C, Huttunen 1996 |
| |
| Melting point, °C : |
| -80 |
Huttunen 1996 |
| |
| Boiling point, °C : |
| 86 |
Huttunen 1996 |
| |
| Flashing point, °C : |
| -11 |
Huttunen 1996 |
| |
| Log octanol/water coefficient, log Pow : |
| 1.55 |
OECD 117, Huttunen et al. 1997 |
| |
| Henry's law constant, Pa x m3/mol : |
| 90 |
at 20 °C, Huttunen et al. 1997 |
| |
| Volatilization : |
TAME is readily volatile and dissolves in water.
If TAME is
released accidentally to surface water, it is expected to be
rapidly dispersed, dissoluted and evaporated.
Based on the
calculated Henry's Law constant, dissolved TAME is readdily
volatile from dilute aqueous solutions (Huttunen et al. 1997).
|
| |
| Mobility : |
If released into soil, TAME is expected to both evaporate and
dissolve in soil water.
Due to low hydophobicity (log Kow) and
soil organic carbon partition coefficient (Koc), TAME is not
expected to be considerably adsorbed onto organic matter in
soil or sediment.
Because of its low density and low kinematic
viscosity, liquid TAME in large volumes is capable to
penetrating soil and reaching the surface of ground water,
where it is expected to dissolve in and spread with ground
water and be reasonably (Huttunen et al. 1997).
|
| |
| Other physicochemical properties : |
Viscosity: 0.50 mm2/s, 40 °C
Explosion limits in air (vol-%): 1.0 - 7.1
Self-ignition temperature: 415 °C
Relative density of vapour (air=1): 3.5
(Huttunen 1996).
|
| |
| Photochemical degradation in air : |
TAME is degradable in the atmosphere by hydroxyl and nitrate
radicals (estimated half-lives appr. 2.1 days in hydroxyl
radical and 5.7 days in nitrate radical reactions) (Huttunen
et al. 1997).
tert-Amyl formate, methyl acetate, acetaldehyde and
formaldehyde were identified as main degradation products
(Huttunen 1996).
|
| |
| Other information of degradation : |
Biodegradability is estimated to be extremely slow.
In
anaerobic conditions TAME was not observed to biodegrade in 6
months in soil and sediment samples (Huttunen 1996).
In the ready biodegradability test, TAME did not pass the
minimum 60 % level of "ready biodegradability".
Observed
biodegradation of TAME was 4%/14 days and also 4%/28 days
(Huttunen et al 1997).
|
| |
| Other information of bioaccumulation : |
TAME is not hydrophobic (log Kow = 1.6) and is not expected to
bioaccumulate (Huttunen et al. 1997).
|
| |
| EC50 values to algae, mg/l : |
| 100 |
>100 mg/l, EbC50, ErC50, 72 hr, |
| |
Selenastrum capricornutum, Huttunen et al. 1997 |
| |
| EC50 values to crustaceans, mg/l : |
| 100 |
>100 mg/l, 48 hr, Daphnia magna, |
| |
Huttunen et al. 1997 |
| |
-- |
| 18 |
72 hr, Mysidopsis bahia, Huttunen 1996 |
| |
| NOEC values to crustaceans, mg/l : |
| 5 |
<5 mg/l, 96 hr, Mysidopsis bahia |
| 83 |
Daphnia magna |
| |
Huttunen 1996 |
| |
| LC50 values to fishes, mg/l : |
| 580 |
96 hr, Oncorhynchus mykiss, Huttunen 1996 |
| |
-- |
| 100 |
>100 mg/l, 96 hr, Oncorhynchus mykiss |
| |
Huttunen et al. 1997 |
| |
| NOEC values to fishes, mg/l : |
| 310 |
Oncorhynchus mykiss, Huttunen 1996 |
References |
| 3337 | Huttunen, H. 1996.
Risk assessment of complex petroleum
substances: hazard identification of NExTAME and reformulated
gasoline.
University of Kuopio, Department of Environmental
Sciences.
ISSN 0786-4728.
|
| 3336 | Huttunen, H., Wyness, L.E. and Kalliokoski, P. 1997.
Identification of environmental hazards of gasoline oxygenate
tert-amyl methyl ether (TAME).
Chemosphere, Vol 35, No 6, pp
1199 - 1214.
|
