EVALUATION OF HUMAN HEALTH RISKS AND EFFECTS ON THE ENVIRONMENT
Evaluation of effects on the environment
(1997) found that the elimination of radiolabelled MTBE in rats was rapid and mainly occurred through lungs and kidneys irrespective of administration route.
Smith, IPCS, welcomed the participants on behalf of Dr M.
Collectively these studies demonstrated that MTBE is rapidly eliminated from blood (half-life = 0.5 h) by exhalation and metabolism to TBA (see Table 15).
Methyl tert-butyl ether - Wikipedia
MTBE was biodegraded anaerobically only to a very limited extent (Pence, 1987b), and an average cumulative theoretical gas production of only 7.1% was achieve within 56 days.
MTBE- Drinking Water Contaminants, Facts/Removal …
Based upon measured rate constants for reactions with hydroxyl radicals in air (Cox & Goldstone, 1982; Atkinson, 1985; Wallington et al., 1988, 1989; Atkinson, 1990; Japar et al., 1990), the half-life for MTBE has been estimated to be between 20.7 and 265 h (Howard et al., 1991).
Oxygenates are added to fuel to increase its oxygen content
4.3.2 Anaerobic conditions Biodegradability of MTBE to methane under anaerobic conditions has been determined by measuring the production of CH4 and CO2 during exposure of MTBE to a large population of anaerobic bacteria.
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Rates of reaction of oxygenates and their decomposition products with hydroxyl radicals at 25°C Compound Rate Reference (10-12 cm3 sec-1 molecule-1) MTBE 3.2 Japar et al., 1991 ETBE 8.5 Japar et al., 1991 TBF 0.74 Smith et al., 1991 TBA 1.1 Japar et al., 1991 Formaldehyde 9.0 Atkinson & Pitts, 1978 2-methoxy-2-methyl propanala 30 Japar et al., 1991 a Estimated from rates for other aldehydes 4.4.2 Natural waters MTBE is not expected to adsorb significantly to bed sediments of suspended sediments, hydrolyse, directly photolyse, or photo-oxidize via reaction with photochemically produced radicals in water.