Chemical ionization quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement

Atmospheric Measurement Techniques

Eger, Philipp G.^1¹  Helleis, Frank^2² 

[1]Atmospheric Chemistry Department, Max-Planck-Institut für Chemie, 55128 Mainz, Germany^1

[2]Department of Natural Sciences, University of Chester, Chester CH2 4NU, UK^2

DOI  :  10.5194/amt-12-1935-2019

学科分类：几何与拓扑

来源: Copernicus Publications

【 摘 要 】

We present a chemical ionization quadrupole mass spectrometer (CI-QMS) with a radio-frequency (RF) discharge ion source through N₂∕CH₃I as a source of primary ions. In addition to the expected detection of PAN, peracetic acid (PAA) and ClNO₂ through well-established ion–molecule reactions with I⁻ and its water cluster, the instrument is also sensitive to SO₂ , HCl and acetic acid ( CH₃C(O)OH ) through additional ion chemistry unique to our ion source. We present ionization schemes for detection of SO₂ , HCl and acetic acid along with illustrative datasets from three different field campaigns underlining the potential of the CI-QMS with an RF discharge ion source as an alternative to ²¹⁰Po . The additional sensitivity to SO₂ and HCl makes the CI-QMS suitable for investigating the role of sulfur and chlorine chemistry in the polluted marine and coastal boundary layer.

【 授权许可】

CC BY