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Acid-extractable heavy metals in PM2.5 over Xi’an, China: seasonal distribution and meteorological influence

  • Pingping Liu
  • Yiling Zhang
  • Tiantian Wu
  • Zhenxing Shen
  • Hongmei XuEmail author
Research Article
  • 42 Downloads

Abstract

To investigate the acid-extractable heavy metals in fine particulate matter (PM2.5) over Xi’an, China, 24-h PM2.5 samples were collected every 3 days from December 2015 through November 2016. The bioavailable fraction, termed here the bioavailability index (BI), of PM2.5-bound metal (As, Ba, Cd, Co, Cu, Mn, Ni, Pb, Ti, V, and Zn) and potential influencing factors, including relative humidity, temperature, air pressure, wind speed, visibility, PM2.5, and SO2 concentrations, were assessed in this study. The annual average PM2.5 concentration was 50.6 ± 35.6 μg m−3, 1.5 times higher than the Chinese national secondary standard. Zn, Ti, and As were the most abundant elements of those analyzed in the PM2.5 samples, accounting for 72.1% of total quantity. The seasonal variations and enrichment factor analysis of heavy metals revealed that coal combustion in winter was a crucial source of Pb, Co, Cu, and Zn; and dust resuspension in spring contributed considerable Mn, Ti, and V. The acid-extractable fractions of the measured metals varied. Pb, Cu, Mn, and Zn exhibited relatively high acid-extractable concentrations and BI values. Pb was mostly in the acid-extractable fraction in PM2.5, with a mean BI value of 66.7%, the highest in summer (69.8%) and lowest in winter (63.7%). Moreover, the BIs of PM2.5-bound heavy metals were inversely related to temperature and wind speed, whereas positively correlated with relative humidity, SO2, and PM2.5 concentration in this study. This study assessed the seasonal distribution and meteorological influence of acid-extractable heavy metals, providing a deeper understanding of atmospheric heavy metal pollution in Xi’an, China.

Keywords

PM2.5 Heavy metals Acid-extractable fractions Bioavailability index Meteorological factors 

Notes

Funding information

This study was supported by the open fund of the State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences (SKLLQG1712, SKLLQG1722) and the Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (KHK1712), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Environmental Science and EngineeringXi’an Jiaotong UniversityXi’anChina
  2. 2.SKLLQG, Institute of Earth EnvironmentChinese Academy of SciencesXi’anChina
  3. 3.Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC)Nanjing University of Information Science & TechnologyNanjingChina

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