Particle Size Distribution of Perfluoroalkyl Substances in Atmospheric Particulate Matter in Beijing

Shuo YANG; Hui-lun CHEN; Nan GAI; Guo-hui LU; Yu ZHENG; Peng-wei SHAO; Yong-liang YANG

doi:10.15898/j.cnki.11-2131/td.20180620074

Shuo YANG, Hui-lun CHEN, Nan GAI, Guo-hui LU, Yu ZHENG, Peng-wei SHAO, Yong-liang YANG. Particle Size Distribution of Perfluoroalkyl Substances in Atmospheric Particulate Matter in Beijing[J]. Rock and Mineral Analysis, 2018, 37(5): 549-557. DOI: 10.15898/j.cnki.11-2131/td.20180620074

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Particle Size Distribution of Perfluoroalkyl Substances in Atmospheric Particulate Matter in Beijing

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BACKGROUNDAnthropogenic emissions of persistent organic pollutants (POPs) tend to be concentrated in fine-level atmospheric particles. However, there are significant differences in the particle size distribution of perfluoroalkyl compounds (PFASs) in atmospheric particulate matter in different countries and regions, and the enrichment capacity of PFASs in different size particulate matter in Beijing is still unclear.OBJECTIVESTo reveal the concentration level and particle size distribution characteristics of perfluoroalkyl substances in atmospheric particulate matter in Beijing, by collecting samples using a five stage impactor sampler and to discuss the effects of atmospheric particulate matter concentration changes on the concentration of perfluoroalkyl substances under different sizes.METHODSThe samples were pretreated by ultrasonic extraction, and the concentrations of PFASs were determined by High Performance Liquid Chromatography-Electrospray Negative Ionization Source Tandem Mass Spectrometry.RESULTSThe concentrations of ∑PFASs are 10.1-62.9 pg/m³, and 76.4%-83.8% of PFASs are concentrated in PM_2.5. PFOA, PFNA and PFDA have the highest concentration in the <0.25 μm particles, accounting for 26.3%-43.7%, 30.3%-68.6% and 30.6%-49.7%, respectively. PFOS is not detected in the fine particles (0.25 μm) and 68.9%-2.8% of PFOS are concentrated in the particles with sizes of 0.25-1 μm and 1-2.5 μm.CONCLUSIONSThe ∑PFASs in the atmospheric particles of smog in Beijing are 3.5 times that of sunny days, and the changes of atmospheric particle concentration of different particle sizes show different enrichment ability for each compound of PFASs, among which PFOA, PFOS, PFNA and PFDA middle chain PFASs are enriched more easily.

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Particle Size Distribution of Perfluoroalkyl Substances in Atmospheric Particulate Matter in Beijing

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