PAHs and Parking Lots: A Field Study of PAHs Exported from ...
Volatilization of PAHs from sealcoated pavement Peter C. Van Metre, Barbara J. Mahler, William...
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Transcript of Volatilization of PAHs from sealcoated pavement Peter C. Van Metre, Barbara J. Mahler, William...
![Page 1: Volatilization of PAHs from sealcoated pavement Peter C. Van Metre, Barbara J. Mahler, William Foreman, Christopher Braun, Jennifer Wilson, Teresa Burbank,](https://reader038.fdocuments.in/reader038/viewer/2022110304/5518c6f2550346881f8b5889/html5/thumbnails/1.jpg)
Volatilization of PAHs from sealcoated
pavement
Peter C. Van Metre, Barbara J. Mahler, William Foreman, Christopher Braun, Jennifer Wilson, Teresa
Burbank, and Rhiannon ReVello
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Mean SPAH in six coal-tar based products (dried 3 days indoors) is ~90,000 mg/kg1
Mean SPAH in 12 scraping samples from coal-tar sealed lots is ~20,000 mg/kg1,2
PAHs in fresh and aged sealcoat
PAHs in fresh and aged sealcoat
1Mahler et al., 2005 2Van Metre et al., 2009
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PATHWAYS
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Ambient Air
Surface air layer
Impervious surface
Ksa=Csurf/Chat,eq
F(T°)
“Hat” sampling1“Hat” sampling1
Gradient: source or sink?1.28 m
0.03 m
1Meijer et al., 2003
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In-use parking lots Ten “in use” parking
lots in Austin, TX. Seven with sealcoat, three unsealed pavement
Summer 4 pm samples at all sites, 4 am samples at five
Pavement dust sampled
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“Pickle” Test Plot Newly CT sealed “test”
plot at UT Pickle Research Campus
Sampled for 1 year: 2 hours after sealing, then after 1, 5, 16, 45, 149, 232, 328, 373 d
Monitored wind and temperature
Collected pavement dust and scraping samples at each time
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Analysis PUFs were ASE extracted
and PAH analyzed by GC/MS
19 PAH quantified 8 PAH frequently
detected: Phe, An, 4,5-MP, 1-MP, Flu, Py, Chy, and B(b)F
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The Solid Phase SPAH8 in dust at in-use lots
Coal-tar sealed (n=6) 1,200 – 7,100 mg/kg Asphalt sealed (n=1) 29 mg/kg Unsealed (n=3) 0.47 – 6.3 mg/kg
SPAH8 at Pickle
Dust (n=2) 2,500 & 1,400 mg/kg Scrapings (n=4) 11,000 – 28,000 mg/kg
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PAH in Air SPAH8 in unsealed lots
HAT = 73 AMB = 26 ng/m3 dC/dzPhe= 17 ng/m
SPAH8 in sealcoated lots
HAT=1,770 AMB = 190 ng/m3 dC/dzPhe = 466 ng/m
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Source/Sink?
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Surface source
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PAH Pickle test plot
SPAH8 2 hours after application
HAT = 290,000 AMB = 5,400 ng/m3
dC/dzPhe= 165,000 ng/m SPAH8 149 days after (during
winter) HAT=291 AMB = 28 ng/m3
dC/dzPhe = 180
35° C
34° 41°
31°
17°
11°
31°
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Trends in Sum-PAH Concentrations
10
100
1,000
10,000
100,000
1,000,000
0 50 100 150 200 250 300 350 400
Days since sealing
SU
M P
AH
(n
g/m
3)
PIC-HAT
PIC-AMB
CT-HAT
CT-AMB
US-HAT
US-AMB
PAH Pickle test plot
R2 = 0.95 t1/2 = 7 days
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Fluxes?Q = u* K’T [Ca(zhat) - Ca(zamb)] (1)
Q = flux [C – C] = air
concentration gradient u* K’T = mass transfer
coefficient
(1) Scholtz et al., 2002
u* K’T is primarily a function of wind speed
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Flux = f (gradient)