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? - PowerPoint PPT PresentationTRANSCRIPT
1
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
19 20 21 22 23 24minutes
0
5
10
15
20
25
30
35
MCounts Sample ex 020708_7-24-2008.SMS TIC40:650
Blank 020708_7-23-2008.SMS TIC40:650
+ 18.3
28 m
in+ 1
8.492
min
+ 18.7
69 m
in
+ 18.9
84 m
in
+ 19.2
64 m
in
+ 19.4
83 m
in+ 1
9.61
3 min
19.78
1 mi
n+
19.96
6 min
20.29
2 min
+ 20.4
01 m
in
+ 20.6
42 m
in + 20
.871 m
in20
.994 m
in
+ 21.2
31 m
in
+ 21
.424 m
in + 21
.693 m
in
+ 21
.969 m
in
+ 22
.218 m
in+ 2
2.393
min
22.59
0 min
+ 22.8
10 m
in
+ 23.0
26 m
in
+ 23.3
95 m
in
+ 23.
711 m
in
+ 24
.036 m
in
+ 24.
282 m
in
24.52
5 min
+ 24.7
35 m
in
+ 24.9
70 m
in
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
ene
born
eol
-te
rpin
eol bo
rnyl
ace
tate
b-ca
ryop
hylle
nehu
mul
ene
C15H24
borneol