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J Hazard Mater. 2018 Sep 5;357:341-347. doi: 10.1016/j.jhazmat.2018.05.058. Epub 2018 May 28.

Impact of particle size on distribution, bioaccessibility, and cytotoxicity of polycyclic aromatic hydrocarbons in indoor dust.

Author information

1
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
2
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: lizzycui@nju.edu.cn.
3
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA.

Abstract

Contaminants, such as polycyclic aromatic hydrocarbons (PAHs), can be absorbed on the particles of indoor dust, which may pose potential health risks. In this study, indoor dust samples were collected and sieved into 6 size fractions (i.e., <43 μm, 43-63 μm, 63-100 μm, 100-150 μm, 150-200 μm, and 200-2000 μm). Ingestion bioaccessibility of PAHs was measured by physiologically based extraction test. Bioaccessibility in fractions of 200-2000 μm was generally higher than those in other particle sizes. Daily uptake doses based on benzo(a)pyrene toxic equivalency quantity were 1.09-15.0 ng/d/kg, and peaked at fractions of <43 μm, while doses considering bioaccessibility ranged from 0.02 to 0.21 ng/d/kg, and peaked at fractions with relatively larger particle size. Cell toxicity was also investigated by human normal liver cell line viability through exposure to organic extracts of indoor dust fractions with various particle sizes. Our results indicated that it is crucial to consider dust particle size and bioaccessibility during risk assessment.

KEYWORDS:

Bioaccessibility; Cytotoxicity; HL-7702; Indoor dust; Polycyclic aromatic hydrocarbons

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