title: Factors influencing on the bioaccessibility of polybrominated diphenyl ethers in size-specific dust from air conditioner filters.
abstract: Size-specific concentrations and bioaccessibility of polybrominated diphenyl ethers (PBDEs) in dust from air conditioner filters were measured, and the factors influencing the PBDE bioaccessibility were determined. Generally, the PBDE concentrations increased with decreasing dust particle size, and BDE209 (deca-BDE) was generally the predominant congener. The bioaccessibility ranged from 20.3% to 50.8% for tri- to hepta-BDEs, and from 5.1% to 13.9% for BDE209 in dust fractions of varied particle size. The bioaccessibility of most PBDE congeners decreased with increasing dust particle size. The way of being of PBDE (adsorbed to dust surface or incorporated into polymers) in dust significantly influenced the bioaccessibility. There was a significant negative correlation between the tri- to hepta-BDE bioaccessibility and organic matter (OM) contents in dust. Furthermore, tri- to hepta-BDE bioaccessibility increased with increasing polarity of OMs, while with decreasing aromaticity of OMs. The tri- to hepta-BDE bioaccessibility significantly positively correlated with the surface areas and pore volumes of dust. Using multiple linear regression analysis, it was found that the OM contents and pore volumes of dust were the most important factors to influence the tri- to hepta-BDE bioaccessibility and they could be used to estimate the bioaccessibility of tri- to hepta-BDEs according to the following equation: bioaccessibility (%)=45.05-0.49 × OM%+1.79 × pore volume. However, BDE209 bioaccessibility did not correlate to any of these factors.
authors.affiliation: Institute of Environmental Pollution and Health, School of Environmental and Contaminant Engineering, Shanghai University, Shanghai 200444, PR China. Electronic address: yuyingxin@staff.shu.edu.cn.
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Yu
authors.forename: Dan
authors.initials: D
authors.lastname: Yang
authors.forename: Xinxin
authors.initials: X
authors.lastname: Wang
authors.forename: Ningbao
authors.initials: N
authors.lastname: Huang
authors.forename: Xinyu
authors.initials: X
authors.lastname: Zhang
authors.forename: Dongping
authors.initials: D
authors.lastname: Zhang
authors.forename: Jiamo
authors.initials: J
authors.lastname: Fu
mesh_terms: D000389:Air Conditioning; D000393:Air Pollutants / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D005374:Filtration / Q000295:instrumentation; D055768:Halogenated Diphenyl Ethers / Q000032:analysis*; D010316:Particle Size
chemical_list: D000393:Air Pollutants; D004391:Dust; D055768:Halogenated Diphenyl Ethers
keywords: Bioaccessibility; Dust; GC/MS; HOCs; In vitro test; NCI; OMs; PAHs; PBDEs; POPs; Particle size; Polybrominated diphenyl ethers; SEM; gas chromatography/mass spectrometry; hydrophobic organic compounds; negative chemical ionization; organic matters; persistent organic pollutants; polybrominated diphenyl ethers; polycyclic aromatic hydrocarbons; scanning electron microscope