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https://doi.org/10.5194/acp-2020-329
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-329
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 May 2020

19 May 2020

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A revised version of this preprint is currently under review for the journal ACP.

Measurement report: Seasonal, distribution and sources of organophosphate esters in PM2.5 from an inland urban city in southwest China

Hongling Yin, Jiangfeng Liang, Di Wu, Shiping Li, Yi Luo, and Xu Deng Hongling Yin et al.
  • College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan, 610025, China

Abstract. Organophosphate esters (OPEs) are emerging contaminants in recent years and studies concluded that urban centers were a significant source of OPEs. Samples were collected from six ground-based sites located in Chengdu, a typical fast developing metropolitan of southwest China and were analyzed for seven OPEs in atmospheric PM2.5. The concentrations of Σ7OPEs in PM2.5 ranged from 5.83 to 6.91 ng m−3, with a mean of 6.6 ± 3.3 ng m−3, and the primary pollutants were TBEP, TnBP, TCEP and TCPP which made up more than 80 % in the Σ7OPEs. The concentrations of Σ7OPEs were higher in autumn/winter than that in summer. Nonparametric test showed that there was no significant difference in Σ7OPEs concentrations among the six sampling sites, but the occurence of unexpected high level of individual OPEs at different sites in autumn might indicate that there was a noteworthy emission. Very strong correlation (R2 = 0.98, p < 0.01) between the OPEs in soil and in PM2.5 suggested the atmospheric PM2.5 settlement is an important source of OPEs in soil. The backward trajectory analysis displayed that OPEs in PM2.5 were mainly affected by local sources. The principal component analysis (PCA) identified the OPEs in PM2.5 were largely sourced from the plastic industry/interior decoration /traffic emission (34.5 %) and chemical, mechanical and electrical industry (27.8 %), while PMF model found the main sources were the plastics industry/indoor source emissions, the food/cosmetics industry, and industrial emissions. Differed from the coastal cities, the sustained and stable high local emissions in the inland city were identified which were particularly noteworthy. The chlorinated phosphate, especially TCPP and TCEP have a high content, whose usage and source emissions should be controlled.

Hongling Yin et al.

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Hongling Yin et al.

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Short summary
OPEs were measured in PM2.5 over 1 year at six sampling sites in Chengdu, a typical inland urban city in southwestern China and comprehensive pollution characteristic of OPEs in PM2.5 were studied and sources were identified by several methods. Differed from the coastal cities, the sustained and stable high local emissions in the inland city were identified which were particularly noteworthy.
OPEs were measured in PM2.5 over 1 year at six sampling sites in Chengdu, a typical inland urban...
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