The real-time detection of the mixing states of polycyclic aromatic hydrocarbons(PAHs)and nitro-PAHs in ambient particles is of great significance for analyzing the source,aging process,and health effects of PAHs and ...The real-time detection of the mixing states of polycyclic aromatic hydrocarbons(PAHs)and nitro-PAHs in ambient particles is of great significance for analyzing the source,aging process,and health effects of PAHs and nitro-PAHs;yet there is still few effective technology to achieve this type of detection.In this study,11 types of PAH and nitro-PAH standard sampleswere analyzed using a high performance-single particle aerosolmass spectrometer(HP-SPAMS)in lab studies.The identification principles‘parent ions’and‘mass-to-charge(m/z)=77’of each compound were obtained in this study.It was found that different laser energies did not affect the identification of the parent ions.The comparative experiments of ambient atmospheric particles,cooking and biomass burning emitted particles with and without the addition of PAHs were conducted and ruled out the interferences from primary and secondary organics on the identification of PAHs.Besides,the reliability of the characteristic ions extraction method was evaluated through the comparative study of similarity algorithm and deep learning algorithm.In addition,the real PAH-containing particles from vehicle exhaust emissions and ambient particles were also analyzed.This study improves the ability of single particle mass spectrometry technology to detect PAHs and nitro-PAHs,and HP-SPAMS was superior to SPAMS for detecting single particles containing PAHs and nitro-PAHs.This study provides support for subsequent ambient observations to identify the characteristic spectrum of single particles containing PAHs and nitro-PAHs.展开更多
在对美国气溶胶飞行时间质谱仪(aerosol time-of-flight mass spectrometer,ATOFMS)和中国单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS)前期研究调研的基础上,总结并比较了国内外飞行时间质谱(time-of-flight ...在对美国气溶胶飞行时间质谱仪(aerosol time-of-flight mass spectrometer,ATOFMS)和中国单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS)前期研究调研的基础上,总结并比较了国内外飞行时间质谱(time-of-flight mass spectrometry,TOF-MS)研究中含硫酸盐、硝酸盐、铵盐、有机碳(OC)和元素碳(EC)等5种主要组分颗粒的典型提取条件.结合SPAMS单颗粒谱图的特点,本研究通过限定示踪离子,对5种主要组分的提取方法进行改进,提出了新的SPAMS组分示踪离子提取方法.以北京市2013年1月SPAMS实测数据为例,对不同提取方法的结果进行对比分析.并将本研究方法 SPAMS主要组分结果与离线滤膜样品的实验数据进行对比,验证了本研究所提出的优化方案的合理性.同时指出SPAMS在未来的应用研究中需考虑的因素及进一步深入的研究方向.展开更多
大气气溶胶因其对气候和公众健康的影响而成为当今环境研究领域的中心课题.单颗粒分析是目前国际上大气气溶胶研究的一个前沿领域,该方法具有高的时间和空间分辨率,能够提供全颗粒物分析所无法提供的大量信息.利用自主研制的单颗粒气溶...大气气溶胶因其对气候和公众健康的影响而成为当今环境研究领域的中心课题.单颗粒分析是目前国际上大气气溶胶研究的一个前沿领域,该方法具有高的时间和空间分辨率,能够提供全颗粒物分析所无法提供的大量信息.利用自主研制的单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS),对广东鹤山地区气溶胶进行在线分析.重点分析含金属颗粒的相关性、数浓度和可能的来源,并简单介绍该仪器的产业化情况.展开更多
基金financially supported by the Key-Area Research and Development Program of Guangdong Province (No. 2020B1111360001)the National Natural Science Foundation of China (NSFC) (No. 41805093, 41827804)+3 种基金the NSFC of Guangdong Province (No. 2021A1515011206)the National Key Research and Development Program of China (No. 2016YFC0200105)Guangdong Special Support Program (No. 2019BT02Z546, 2019TQ05L169)the Guangdong Enterprise Science and Technology Commissioner Project (No. GDKTP2020035200)
文摘The real-time detection of the mixing states of polycyclic aromatic hydrocarbons(PAHs)and nitro-PAHs in ambient particles is of great significance for analyzing the source,aging process,and health effects of PAHs and nitro-PAHs;yet there is still few effective technology to achieve this type of detection.In this study,11 types of PAH and nitro-PAH standard sampleswere analyzed using a high performance-single particle aerosolmass spectrometer(HP-SPAMS)in lab studies.The identification principles‘parent ions’and‘mass-to-charge(m/z)=77’of each compound were obtained in this study.It was found that different laser energies did not affect the identification of the parent ions.The comparative experiments of ambient atmospheric particles,cooking and biomass burning emitted particles with and without the addition of PAHs were conducted and ruled out the interferences from primary and secondary organics on the identification of PAHs.Besides,the reliability of the characteristic ions extraction method was evaluated through the comparative study of similarity algorithm and deep learning algorithm.In addition,the real PAH-containing particles from vehicle exhaust emissions and ambient particles were also analyzed.This study improves the ability of single particle mass spectrometry technology to detect PAHs and nitro-PAHs,and HP-SPAMS was superior to SPAMS for detecting single particles containing PAHs and nitro-PAHs.This study provides support for subsequent ambient observations to identify the characteristic spectrum of single particles containing PAHs and nitro-PAHs.
文摘在对美国气溶胶飞行时间质谱仪(aerosol time-of-flight mass spectrometer,ATOFMS)和中国单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS)前期研究调研的基础上,总结并比较了国内外飞行时间质谱(time-of-flight mass spectrometry,TOF-MS)研究中含硫酸盐、硝酸盐、铵盐、有机碳(OC)和元素碳(EC)等5种主要组分颗粒的典型提取条件.结合SPAMS单颗粒谱图的特点,本研究通过限定示踪离子,对5种主要组分的提取方法进行改进,提出了新的SPAMS组分示踪离子提取方法.以北京市2013年1月SPAMS实测数据为例,对不同提取方法的结果进行对比分析.并将本研究方法 SPAMS主要组分结果与离线滤膜样品的实验数据进行对比,验证了本研究所提出的优化方案的合理性.同时指出SPAMS在未来的应用研究中需考虑的因素及进一步深入的研究方向.
文摘大气气溶胶因其对气候和公众健康的影响而成为当今环境研究领域的中心课题.单颗粒分析是目前国际上大气气溶胶研究的一个前沿领域,该方法具有高的时间和空间分辨率,能够提供全颗粒物分析所无法提供的大量信息.利用自主研制的单颗粒气溶胶质谱仪(single particle aerosol mass spectrometer,SPAMS),对广东鹤山地区气溶胶进行在线分析.重点分析含金属颗粒的相关性、数浓度和可能的来源,并简单介绍该仪器的产业化情况.
