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PAHs in House Dust and their Relation to Pavement Sealcoat. Barbara J. Mahler and Peter C. Van Metre U.S. Geological Survey. Benzo(a)pyrene. Pyrene. Naphthalene. What are polycyclic aromatic hydrocarbons (PAHs)?. Why are PAHs going up???. The first clues. Coal-tar sealcoat. =.

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pahs in house dust and their relation to pavement sealcoat

PAHs in House Dustand their Relation to Pavement Sealcoat

Barbara J. Mahler and Peter C. Van Metre

U.S. Geological Survey

slide5

Coal-tar sealcoat

=

Used motor oil

slide7

Sealcoated Pavement Dust PAH (mg/kg)

Asphalt

Coal tar

5.2

570

<13

3,400

1,300

3,800

2.1

3,200

1,200

Composite dust sample

23 ground floor apartments
23 ground-floor apartments

“coffee” = asphalt sealcoat

“tea” = coal-tar sealcoat

median s pah m g g
Median SPAH [mg/g]

n=12

n=11

5.1

129

9.0

4,760

Out-CT = 530 * Out-NCT

In-CT = 25 * In-NCT

factors explaining pah in house dust
Factors explaining PAH in house dust
  • Coal-tar based sealcoat explains ~50% of variance in log-transformed T-PAH
  • Coal-tar based sealcoat and urban land-use together explain 60% of variance
s b2 pah m g g
SB2PAH [mg/g]

max 156

2.6

47

4.4

2,040

> 40 mg/g SB2 PAH results in excess cancer risk

of > 1 x 10-4 (Maertens et al., 2004)

benzo a pyrene m g g
Benzo[a]pyrene [mg/g]

max 24.2

0.44

4.5

0.53

285

Exposure to 10 mg/g should be minimized to avoid adverse health effects (German Federal Environmental Agency)

conclusions and implications
Conclusions and Implications
  • Coal-tar based pavement sealcoat associated with elevated PAHs in house dust
  • Concentrations and human health risk