Investigation of oxidative potential of fresh and O_(3)-aging PM_(2.5)from various emission sources across urban and rural regions  

作　　者：Shuaishuai Ma Dongsheng Cheng Yingying Tang Younuo Fan Qiong Li Chengxiang He Zhiqing Zhao Tianyou Xu 

机构地区：[1]College of Chemical and Material Engineering,Quzhou University,Quzhou 324000,China [2]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention,Department of Environmental Science&Engineering,Fudan University,Shanghai 200433,China

出　　处：《Journal of Environmental Sciences》2025年第5期608-615,共8页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.42305109);Quzhou Municipal Science and Technology Bureau(No.2023K222).

摘　　要：Inhalation of atmospheric PM_(2.5)can induce the generation of excessive reactive oxygen species(ROS)in human alveoli,triggering local and systemic inflammation,which can directly or indirectly result in respiratory and cardiovascular diseases.In this study,we assessed the oxidative potential(OP)of fresh and O_(3)-aged PM_(2.5)particles from various urban and rural emission sources using the dithiothreitol(DTT)method.Our results revealed variations in the OP of fresh PM_(2.5)among different emission sources,with biomass burning sources exhibiting the highest OP,followed by industrial areas,vehicular emissions,cooking emissions,and suburban areas,respectively.Water-soluble organics and transition metals might potentially exert significant influence on particle OP.O_(3)aging notably decreased the OP of PM_(2.5)particles,possibly due to the oxidation of highly DTT-active components into low redox-active small molecules.Moreover,the evolution of OP in different PM_(2.5)components,including methanol-soluble and insoluble fractions,exhibited distinct responses to O_(3)aging for source-oriented PM_(2.5).Additionally,differences in chemical composition between fresh and aged PM_(2.5)were further elucidated through measurements of component-dependent hygroscopic behaviors and phase transitions.This study systematically delineates variances in the toxic potential of fresh and O_(3)-aged PM_(2.5)from various anthropogenic sources.The findings highlight the intrinsic compositional dependence of particle OP and provide essential insights for assessing the health effects of source-oriented PM_(2.5),as well as for formulating human health protection policies.

关 键 词：Atmospheric PM_(2.5) Oxidative potential Emission sources DTT assay O_(3)aging 

分 类 号：TG1[金属学及工艺—金属学]