Risk assessments of PAHs and Hg exposure via settled house dust and street dust, linking with their correlations in human hair
2013
Wang, Wei | Wu, Fuyong | Zheng, Jinshu | Wong, Ming Hung
Domestic energy, chemicals bioaccessibility and particle size were found as three critical factors for risk assessment of PAHs exposure via settled house dust (SHD) and street dust. ∑PAHs and Hg contained in SHD were significantly (p<0.01) higher in coal-burning households of Qingyang (8.45–121; 0.48–16.4μgg−1) than households in Guangzhou (1.23–22.2; 0.004–10.6μgg−1) and 90% coal-burning houses were estimated with unacceptable cancer risks (>10−4) via SHD exposure. The highest accumulation trend of PAHs and Hg were found in <63μm particles, and different particle sizes resulted in large variations of the obtained risks (up to 10 fold). Bioaccessibility corrected PAHs led to a significant decrease on related cancer risks and decreased in the order of 1.9, 1.1, 0.6 and 0.4μgg−1 with the increase of particle sizes (<63, 63–100, 100–280, 280–2000μm). Scalp hair was tested as an indicator of body burdens of PAHs (0.05–0.9μgg−1) and Hg (0.04–1.6μgg−1). Different PAHs profiles were found between PAHs in SHD and those of hair, indicating that exogenous exposure to PAHs adsorbed on dust was not the major source of hair PAHs.
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