Characterizing leaf-deposited particles: Single-particle mass spectral analysis and comparison with naturally fallen particles  

作　　者：Dele Chen Hua-Yun Xiao Ningxiao Sun Jingli Yan Shan Yin 

机构地区：[1]School of Agriculture and Biology,Shanghai Jiao Tong University,800 Dongchuan Rd.,Shanghai 200240,China [2]Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station,Ministry of Science and Technology,Ministry of Education,800 Dongchuan Rd.,Shanghai 200240,China [3]Shanghai Urban Forest Ecosystem Research Station,National Forestry and Grassland Administration,800 Dongchuan Rd.,Shanghai 200240,China

出　　处：《Environmental Science and Ecotechnology》2024年第5期318-328,共11页环境科学与生态技术（英文）

基　　金：supported by the National Key Research and Development Project(2022YFF1301104);the National Natural Science Foundation of China(32171865;42271096)。

摘　　要：The size and composition of particulate matter(PM)are pivotal in determining its adverse health effects.It is important to understand PM's retention by plants to facilitate its atmospheric removal.However,the distinctions between the size and composition of naturally fallen PM(NFPM)and leaf-deposited PM(LDPM)are not well-documented.Here we utilize a single-particle aerosol mass spectrometer,coupled with a PM resuspension chamber,to analyze these differences.We find that LDPM particles are 6.8 e97.3%larger than NFPM.Employing a neural network algorithm based on adaptive resonance theory,we have identified distinct compositional profiles:NFPM predominantly consists of organic carbon(OC;31.2%)and potassium-rich components(19.1%),whereas LDPM are largely composed of crustal species(53.9e60.6%).Interestingly,coniferous species retain higher OC content(11.5e13.7%)compared to broadleaved species(0.5e1.2%),while the levoglucosan content exhibit an opposite trend.Our study highlights the active role of tree leaves in modifying PM composition beyond mere passive capture,advocating for a strategic approach to species selection in urban greening initiatives to enhance PM mitigation.These insights provide guidance for urban planners and environmentalists in implementing nature-based solutions to improve urban air quality.

关 键 词：Particulate matter Dry deposition PHYTOREMEDIATION Size distribution Chemical composition Source apportionment 

分 类 号：X52[环境科学与工程—环境工程]