【摘 要】
：
Water-insoluble organic compounds (WIOCs) are an important fraction of atmospheric fine particulate matters (PM2.5),which could affect the climate system and threaten human health potentially.In this study,molecular characterization of WIOCs in PM2.5 were
【机 构】
：
CAS Key Laboratory of Separation Sciences for Analytical Chemistry,Dalian Institute of Chemical Phys
论文部分内容阅读
Water-insoluble organic compounds (WIOCs) are an important fraction of atmospheric fine particulate matters (PM2.5),which could affect the climate system and threaten human health potentially.In this study,molecular characterization of WIOCs in PM2.5 were investi-gated by 15 T Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) with atmospheric pressure photoionization (APPI) source in positive ion mode.A total of 2573 and 1875 molecular formulas were identified in WIOCs extracted by dichloromethane,which were collected in hazy and normal days,respectively.The identified molecular formulas were further classified into four major subgroups,including CH,CHN,CHO and CHNO com-pounds.CHO compounds predominated in WIOCs,accounting for more than 60％ in both samples.CHNO compounds (26.6％) and CH compounds (16.1％) were the second highest subgroups in WIOCs from the hazy days and normal days,respectively.The relative abun-dance and number of nitro-substituted aromatic compounds were significantly higher in hazy days than in normal days.The molecular composition of WIOCs was more complex in hazy days while more aromatic compounds were identified in normal days.
其他文献
The greatest problem in conventional Fenton reaction is the slow production of ROS (reactive oxygen species) because of the inefficient Fe3+/Fe2+ conversion.Based on the extraordinary photo-response property of two-dimensional molybdenite (2DM),photogener
Nowadays,more people tend to spend their recreational time in large national parks,and trace metal(loid)s in soils have attracted long-term attention due to their possible harm to human health.To investigate the pollution levels,potential sources and heal
Naturally complete mixing promotes the spontaneous redistribution of dissolved oxygen(DO),representing an ideal state for maintaining good water quality,and conducive to the biomineralization of organic matter.Water lifting aerators (WLAs) can extend the
Dechloranes are a group of halogenated flame retardants with a basic bicyclo[2.2.1]heptene,including Dechlorane Plus (DP),Dechlorane 602 (Dec 602),Dechlorane 603 (Dec 603) and Dechlorane 604 (Dec 604).A few epidemiological investigations and animal experi
Soil is a major sink for per-and perfluoroalkyl substances (PFAS),wherein PFAS may be transferred through the food chain to predators at upper trophic levels,which poses a threat to human health.Herein,the concentrations and distributions of legacy and no
The scientific application of stabilized materials has been considered an effective method for the in situ remediation of Cd-contaminated soil.This study aimed to investigate the per-sistence of the effect of a combined amendment of limestone and sepiolit
New particle formation (NPF) events are an increasingly interesting topic in air quality and climate science.In this study,the particle number size distributions,and the frequency of NPF events over Hefei were investigated from November 2018 to February 2
Alumina supported Pd catalyst (Pd/Al2O3) is active for complete oxidation of methane,while often suffers transient deactivation during the cold down process.Herein,heating and cool-ing cycle tests between 200 and 900℃ and isothermal experiments at 650℃ we
A thorough understanding of chemical composition,particle pH,and pollutant emissions is essential to address the climate and human health effects of atmospheric particles.In this study,we used a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR
Benzene is a carcinogenic air pollutant for which European legislation has set an annual limit and criteria for the number of fixed monitoring sites within air quality networks(AQMN).However,due to the limited number of fixed sites for benzene measurement