首页|气溶胶粒子相有机物在线检测的空气动力学透镜-质子转移反应质谱装置研制

气溶胶粒子相有机物在线检测的空气动力学透镜-质子转移反应质谱装置研制

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针对气溶胶粒子相有机物的在线检测分析,设计加工了一套空气动力学透镜进样系统.该进样系统主要由 1个用于气相有机物去除的气相剥蚀模块、1个用于颗粒聚焦富集的空气动力学透镜模块和 1个用于粒子相有机物提取的热解吸模块组成.气相剥蚀模块的气相有机物去除率可达 98.89%,295～375 nm粒径范围内颗粒物的透过率为 75.16%～91.15%.模拟结果表明,在所设计的空气动力学透镜中,0.36～6.0 μm粒径范围内颗粒物的透过率可达 90%以上.将本研究设计的进样系统与实验室自制的质子转移反应质谱仪联用,研制了 1套空气动力学透镜-质子转移反应质谱装置,并通过模拟气溶胶样品(α-蒎烯和臭氧反应的产物)的检测,证实了该装置可实现亚微米至几微米级粒子相上有机物的在线检测.
Development of an Aerodynamic Lens-Proton Transfer Reaction Mass Spectrometry(PTR-MS)Apparatus for Online Detection of Organic Compounds in Aerosol Particles
Atmospheric organic aerosols consist of both gas-phase organic compounds and particle-phase organic compounds.The components of aerosol particles(solid or liquid droplets)can undergo exchange or chemical reactions with gas-phase components,influencing atmospheric physical and chemical processes and potentially impacting atmospheric environment,climate,and human health.Methods for detecting organic compounds in aerosol particle phase are classified into offline and online detection.Offline detection methods involve collecting aerosol samples for analysis using chromatography-mass spectrometry,which is time-consuming and limited sensitivity.Online detection methods involve enriching aerosols through aerodynamic lens and then detecting them using laser ablation or electron impact ionization techniques.However,these methods usually generate a large number of ion fragments,making mass spectrum analysis difficult.Therefore,it is necessary to develop an online detection method for aerosol particle-phase organic compounds with soft ionization and high sampling efficiency.In the present work,a set of aerodynamic lens sampling systems was designed and developed for online detection and analysis of organic compounds in aerosol particle phase.This sampling system consists of a gas-phase stripping module for removing gas-phase organic compounds,an aerodynamic lens module for particle focusing and enrichment,and a thermal desorption module for extracting particle-phase organic compounds.The efficiency of gas-phase organic compound removal and the particle transmission rate of the gas-phase stripping module were firstly investigated.The results showed that gas-phase stripping module achieves a removal efficiency of 98.89%for gas-phase organic compounds,and the particle transmission rate ranges from 75.16%to 91.15%for particles with the diameters between 295 and 375 nm.Subsequently,the effectiveness of the aerodynamic lens was studied through theoretical simulations.The simulation results indicated that the transmission rate of particles in the diameters of 0.36-6.0 μm is above 90%in the designed aerodynamic lens.Finally,The designed aerodynamic lens sampling system with a homemade proton transfer reaction mass spectrometer(PTR-MS)was integrated to develop an aerodynamic lens-PTR-MS device.This device was tested by detecting simulated aerosol samples containing reaction products of α-pinene and ozone.The mass spectrometry results demonstrated that the intensity changes of the examined ten ions are closely related to the presence of α-pinene,confirming that the device can achieve online detection of organic compounds in aerosols ranging from submicron to several micrometers.

organic compounds in aerosol particleaerodynamic lensproton transfer reaction mass spectrometry(PTR-MS)real-time detection

李艳文、鲍珣、丁月婷、梁渠、张强领、陆燕、夏磊、刘亚伟、邹雪、黄超群、沈成银、储焰南

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安徽大学,安徽合肥 230039

中国科学院合肥物质科学研究院健康与医学技术研究所,医学物理与技术安徽省重点实验室,安徽合肥 230031

气溶胶粒子相有机物 空气动力学透镜 质子转移反应质谱(PTR-MS) 实时检测

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金安徽省重点研发计划项目安徽省重点研发计划项目

2207619022376198223061876217143322073100202104d070200032022a05020034

2024

10.7538/zpxb.2024.0019

质谱学报
北京中科科仪技术发展有限责任公司 中国物理学会质谱分会

质谱学报

CSTPCD北大核心EI
影响因子：1.046
ISSN：1004-2997
年,卷(期)：2024.45(5)