The Relative Contributions of Different Chemical Components to the Oxidative Potential of Ambient Fine Particles in Nanjing Area

Xiaoyun Ma, Dongyang Nie, Mindong Chen, Pengxiang Ge, Zhengjiang Liu, Xinlei Ge, Zhirao Li and Rui Gu
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Xiaoyun Ma: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Dongyang Nie: School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China
Mindong Chen: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Pengxiang Ge: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Zhengjiang Liu: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Xinlei Ge: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Zhirao Li: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Rui Gu: Siegwerk Shanghai Ltd., Shanghai 201108, China

IJERPH, 2021, vol. 18, issue 6, 1-17

Abstract: Ambient fine particles (PM 2.5 ) have been shown to have adverse health effects by inducing oxidative stress. Here, dithiothreitol (DTT)-based oxidative potential (OP) was used to assess the capacity of oxidative stress caused by PM 2.5 . In this study, PM 2.5 samples were collected in the Nanjing area in 2016, and physicochemical properties and DTT activity were investigated. The annual mean PM 2.5 mass concentration was 73 ?g m ?3 and greatly varied among seasons (spring > winter > summer > autumn). Three fluorescent substances were identified by the excitation-emission matrix (EEM) spectrum. The annual mean mass-normalized DTT activity (DTT m ; 0.02 nmol min ?1 ?g ?1 ) was similar to that documented for cities of some developed countries. The annual mean volume-normalized DTT activity (DTT v ) showed a relatively high value of 1.16 nmol min ?1 m ?3 , and the seasonal mean DTT v was highest in winter, followed by spring, autumn, and summer, whose pattern is different from PM 2.5 mass concentration. Correlation and multiple linear regression analysis suggested that transition metals may have a greater effect on OP in autumn and winter, humic-like substances and UV absorbing aromatic substances may have a strong effect on OP in spring and summer. Generally, this study enhances our understanding of seasonal variation in health effects associated with PM 2.5 .

Keywords: ambient fine particles; oxidative potential; dithiothreitol; excitation-emission matrix (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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