摘要
于2018年4月在华北某城市开展了基于单颗粒气溶胶飞行时间质谱仪(SPAMS)的连续在线监测,期间发现了一次伴随降水过程的颗粒相三甲胺增长过程。采集的颗粒物平均谱图中含有明显的三甲胺(TMA)信号((CH_(3))_(3)N^(+),m/z=59),含有TMA颗粒物占59.4%。随相对湿度增长,TMA占比增加,颗粒物出现明显的吸湿增长,整体向大粒径段偏移。TMA峰面积表现出与硝酸盐、亚硝酸盐峰面积的同步增加,且亚硝酸盐的影响更为显著。整体形成了“高湿—气粒转化—吸湿增长—TMA峰面积增长”的一种相互促进的机制。
A continuous online monitoring based on Single Particle Aerosol Mass Spectrometer(SPAMS) was carried out in a city in North China in April 2018.During the period,a process of particulate trimethylamine(TMA) growth accompanied by precipitation was discovered.The average spectra of particles contained obvious TMA signals((CH_(3))^(3)N^(+),m/z = 59),and the percentage of particles which contained TMA was 59.4%.The proportion of TMA increased with the increase of relative humidity,and the particulate matter exhibited a significant hygroscopic growth which leads to the diameters’ shift to the large particle size section.The peak area of TMA showed a simultaneous increase with the peak areas of nitraten and nitrite,and the effect of nitrite was more remarkable.It formed a mechanism of mutual promotion including “high humidity-air particle transformation-hygroscopic growth-TMA peak area growth”.
作者
马佳
Ma Jia(Kunshan Hexin Mass Spectrometry Technology Co.,Ltd.,Suzhou,Jiangsu 215300,China)
出处
《绿色科技》
2022年第16期104-109,共6页
Journal of Green Science and Technology
关键词
三甲胺
单颗粒气溶胶飞行时间质谱仪
高湿
吸湿增长
硝酸盐
trimethylamine
single-particle aerosol time-of-flight mass spectrometry
high humidity
hygroscopic growth
nitrates
