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
2
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
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