Brake wear-derived particles:Single-particle mass spectral signatures and real-world emissions  

作　　者：Jiayuan Liu Jianfei Peng Zhengyu Men Tiange Fang Jinsheng Zhang Zhuofei Du Qijun Zhang Ting Wang Lin Wu Hongjun Mao 

机构地区：[1]Tianjin Key Laboratory of Urban Transport Emission Research,College of Environmental Science and Engineering,Nankai University,Tianjin,300071,China

出　　处：《Environmental Science and Ecotechnology》2023年第3期88-97,共10页环境科学与生态技术（英文）

基　　金：supported by the National key research and development program of China(2022YFE0135000);the Tianjin Science and Technology Plan Project(19YFZCSF00960);the National Natural Science Foundation of China(42177084,42175123,42107114,42107125);the Natural Science Foundation of Tianjin(20JCYBJC01270);the Fundamental Research Funds for the Central Universities(63221411).

摘　　要：Brake wear is an important but unregulated vehicle-related source of atmospheric particulate matter(PM).The single-particle spectral fingerprints of brake wear particles(BWPs)provide essential information for understanding their formation mechanism and atmospheric contributions.Herein,we obtained the single-particle mass spectra of BWPs by combining a brake dynamometer with an online single particle aerosol mass spectrometer and quantified real-world BWP emissions through a tunnel observation in Tianjin,China.The pure BWPs mainly include three distinct types of particles,namely,Bacontaining particles,mineral particles,and carbon-containing particles,accounting for 44.2%,43.4%,and 10.3%of the total BWP number concentration,respectively.The diversified mass spectra indicate complex BWP formation pathways,such as mechanical,phase transition,and chemical processes.Notably,the mass spectra of Ba-containing particles are unique,which allows them to serve as an excellent indicator for estimating ambient BWP concentrations.By evaluating this indicator,we find that approximately 4.0%of the PM in the tunnel could be attributable to brake wear;the real-world fleet-average emission factor of 0.28 mg km1 veh1 is consistent with the estimation obtained using the receptor model.The results presented herein can be used to inform assessments of the environmental and health impacts of BWPs to formulate effective emissions control policies.

关 键 词：Non-exhaust emission Brake wear Single-particle aerosol mass spectrometry Tunnel measurement Emission factor 

分 类 号：X51[环境科学与工程—环境工程]