A Thermal Desorption Chemical Ionization Ion Trap Mass Spectrometer for the Chemical Characterization of Ultrafine Aerosol Particles
A Thermal Desorption Chemical Ionization Ion Trap Mass Spectrometer for the Chemical Characterization of Ultrafine Aerosol Particles
复制标题
用于超细气溶胶颗粒化学表征的热解吸化学电离离子阱质谱仪
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Smith
中科院分区：
文献类型：
--
作者：
A. Held;G. Rathbone;J. Smith
本文报道了一种用于超细气溶胶粒子化学表征的热解吸化学电离离子阱质谱仪的研制和首次实验结果。大气颗粒物的大小分类和收集使用单极充电器，径向微分迁移率分析仪和静电除尘器，并进行热解吸和化学电离后，使用离子阱质谱仪进行分析。离子阱质谱仪的集成允许每0.5秒快速扫描整个质谱，并具有通过串联质谱法识别未知颗粒化合物的潜力。颗粒收集效率的范围从25 nm颗粒的90-100%到40 nm颗粒的约50%。在当前配置中，仪器对铵的绝对灵敏度在10-100 pg NH + 4范围内。在科罗拉多前线采集的环境样品中，NH + 4是正离子光谱中的主要信号峰，并发现了其他次要信号和有机化合物（包括甲胺）的峰型。
The development of a thermal desorption chemical ionization ion trap mass spectrometer for the chemical characterization of ultrafine aerosol particles is reported and first experimental results are presented. Atmospheric particles are size-classified and collected using a unipolar charger, a radial differential mobility analyzer and an electrostatic precipitator, and analyzed after thermal desorption and chemical ionization using an ion trap mass spectrometer. Integration of an ion trap mass spectrometer allows for fast scans of the entire mass spectrum every 0.5 s and bears the potential to identify unknown particulate compounds by tandem mass spectrometry. Particle collection efficiencies range from 90–100% for 25 nm particles to about 50% for 40 nm particles. In the current configuration, the absolute sensitivity of the instrument with regard to ammonium is in the range of 10–100 pg NH + 4 . In ambient samples collected in the Colorado Front Range, NH + 4 was the major signal peak in the positive ion spectrum, and additional minor signals and peak patterns of organic compounds including methylamine were found.