atmospheric environment 37 (2003) 4747–4755atmospheric environment 37 (2003) 4747–4755
TRANSCRIPT
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Atmospheric Environment 37 (2003) 4747–4755
Analysis of methyl tert-butyl ether in the atmosphere and implications as an exclusive
indicator of automobile exhaust
Speaker : Snow
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Octane-enhancing gasoline additive
Enhancing the combustion efficiency
1996, U.S Santa Monica contamination
MTBE
Reduce CO、 Hydrocarbons、 O3
Reduce possibility of explosion
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Contamination
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Quick diagnosis for emission source
X
Y
Y - X
Y
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Field mission
Site I : Hsinchu, Guangfu Rd.
Site II : Hsinchu, Baoshan Rd.
Site III : Kaushiung city
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濃縮 分離 偵測
(a)
(b)
Preconcentrator
Trap volume
190 ml
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PLOT
DB-1
Instrumental
FID MS scan range
10-180
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Chromatogram of C2 – C4
GC-FID
1. Ethtane
2. Ethylene
3. Propane
4. Propene
5. Ethyne
6. Isobutane
7. n-butane
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Chromatogram of C4 - C10
1. Isobutane
2. Isopentane
3. MTBE
4. 2-methylpentane
5. Benzene
6. Toluene
7. Ethylbenzene
8. m,p-xylene
9. Styrene
10. o-xylene
11. 1,2,4-trimethylbenzene
GC/MS
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Standard
TIC
real sample
TIC
real sample
SIM
GC/MS analysis
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Precision & MDL - I
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Precision & MDL - II
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Diurnal variation – site I
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Validation
NMHCs/MTBE Site I Site II
Ethene 4.7 4.9
Benzene 1.0 1.0
Toluene 4.4 4.9
Ethylbenzene 0.9 0.8
o-Xylene 1.4 1.1
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Correlations of VOCs & MTBE – site III
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Chemical & physical removal
Chemical removal : photochemical reaction
Physical removal : wet deposition
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Ratio of longer-lived VOCs to MTBE – site I
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Analytical system was established to measure VOCs and MTBE simultaneously without interference from water.
In urban areas, MTBE was highly correlated with most VOCs.
Using VOCs/MTBE can quickly diagnosis VOCs emissions source.
MTBE can be a useful exclusive indicator of traffic emissions.
Conclusion