DOI: 10.1016/j.atmosenv.2015.08.028
Scopus记录号: 2-s2.0-84939785585
论文题名: Development of a new corona discharge based ion source for high resolution time-of-flight chemical ionization mass spectrometer to measure gaseous H2SO4 and aerosol sulfate
作者: Zheng J ; , Yang D ; , Ma Y ; , Chen M ; , Cheng J ; , Li S ; , Wang M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 119 起始页码: 167
结束页码: 173
语种: 英语
英文关键词: Corona discharge
; HRToF-CIMS
; Hydroxyl radicals
; Sulfate
; Sulfuric acid
Scopus关键词: Atmospheric aerosols
; Atmospheric ionization
; Atmospheric pressure
; Electric corona
; Ion sources
; Ionization
; Ionization of gases
; Mass spectrometers
; Molecules
; Nitrogen oxides
; Spectrometers
; Sulfur compounds
; Sulfur dioxide
; Sulfuric acid
; Atmospheric pressure ionization
; Chemical ionization
; Corona discharges
; HRToF-CIMS
; Hydroxyl radicals
; Ion-molecule reaction
; Potential interferences
; Sulfate
; Aerosols
; ammonium sulfate
; hydroxyl radical
; nitrate
; nitric acid
; nitrogen dioxide
; sulfate
; sulfur dioxide
; sulfuric acid
; aerosol formation
; atmospheric pressure
; corona
; cost analysis
; desorption
; experimental apparatus
; filter
; hydroxyl radical
; ionization
; mass spectrometry
; measurement method
; nitrate
; nitric acid
; nitrogen dioxide
; sulfate
; sulfur dioxide
; sulfuric acid
; aerosol
; air
; Article
; atmospheric pressure
; calibration
; chemical reaction
; controlled study
; corona discharge
; desorption
; electricity
; gas
; high resolution time of flight chemical ionization mass spectrometer
; ionization
; laboratory
; mass spectrometer
; noise
; priority journal
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: A new corona discharge (CD) based ion source was developed for a commercial high-resolution time-of-flight chemical ionization mass spectrometer (HRToF-CIMS) (Aerodyne Research Inc.) to measure both gaseous sulfuric acid (H2SO4) and aerosol sulfate after thermal desorption. Nitrate core ions (NO3-) were used as reagent ions and were generated by a negative discharge in zero air followed by addition of excess nitrogen dioxide (NO2) to convert primary ions and hydroxyl radicals (OH) into NO3- ions and nitric acid (HNO3). The CD-HRToF-CIMS showed no detectable interference from hundreds parts per billion by volume (ppbv) of sulfur dioxide (SO2). Unlike the atmospheric pressure ionization (API) ToF-CIMS, the CD ion source was integrated onto the ion-molecule reaction (IMR) chamber and which made it possible to measure aerosol sulfate by coupling to a filter inlet for gases and aerosols (FIGAERO). Moreover, compared with a quadrupole-based mass spectrometer, the desired HSO4- signal was detected by its exact mass of m/z 96.960, which was well resolved from the potential interferences of HCO3-{dot operator}(H2O)2 (m/z 97.014) and O-{dot operator}H2O{dot operator}HNO3 (m/z 97.002). In this work, using laboratory-generated standards the CD-HRToF-CIMS was demonstrated to be able to detect as low as 3.1 × 105 molecules cm-3 gaseous H2SO4 and 0.5 μg m-3 ammonium sulfate based on 10-s integration time and two times of the baseline noise. The CD ion source had the advantages of low cost and a simple but robust structure. Since the system was non-radioactive and did not require corrosive HNO3 gas, it can be readily field deployed. The CD-HRToF-CIMS can be a powerful tool for both field and laboratory studies of aerosol formation mechanism and the chemical processes that were critical to understand the evolution of aerosols in the atmosphere. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81567
Appears in Collections: 气候变化事实与影响
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作者单位: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing, China; Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing, China
Recommended Citation:
Zheng J,, Yang D,, Ma Y,et al. Development of a new corona discharge based ion source for high resolution time-of-flight chemical ionization mass spectrometer to measure gaseous H2SO4 and aerosol sulfate[J]. Atmospheric Environment,2015-01-01,119