The German unemployment since the Hartz reforms: Permanent ...
Huff Hartz Research Group
description
Transcript of Huff Hartz Research Group
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Huff Hartz Research Group• What are aerosol yields from a precursor mixture
that reflects the complexity of atmospheric emissions?
• Do the aerosol yields in smog chamber experiments mimic those found in the atmosphere?
• What are the oxidation products of biogenic precursor mixtures?
• Our approach: essential oils
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SIUC Environmental Chamber
5 m3 Teflon Chamber
Air Filtration System
Ozone Monitor
Scanning Mobility Particle Sizer
Injection Port
Ozone Generator
Filter Samples
Ion trap GCMS
Solid-Phase Microextraction
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MCounts Sample ex 020708_7-24-2008.SMS TIC40:650
Blank 020708_7-23-2008.SMS TIC40:650
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2D Graph 1
Gas-phase -pinene Concentration, ppm
0 1 2 3 4
106 x P
eak
Are
a,
kcou
nts-
min
0
1
2
3
Col 1 vs Col 2 Col 7 vs Col 8
Headspace SPME
-pinene SOAextract
blank
O
O
OSiMe3
IS
IS
OMe3SiO
O
OSiMe3
3
SOA from Siberian Fir Needle OilMo, mg/m3
bornyl acetate 780camphene 523
-pinene 2803-carene 210limonene 105terpinolene 26-terpineol 6b-pinene 18borneol 20sesquiterpenes <20Total Mo, mg/m3 665
SOA Mass, mg/m3 282
If we apply the two- component model of Presto et al.:
Yield = 0.32
Yield = 0.42
OH
bornyl acetate camphene
3-carene
-pinene
limonene terpinolene
-terpineolb-pinene
OH
borneol
O
O
Time, min.
Tota
l Ion
Cou
nt
-p
inen
eca
mph
ene
b-pi
nene 3-
care
nelim
onen
e
terp
inol
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born
eol
-te
rpin
eol bo
rnyl
ace
tate
b-ca
ryop
hylle
nehu
mul
ene
C15H24
borneol