Chemical ionization quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement
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Published:2019-03-26
Issue:3
Volume:12
Page:1935-1954
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Eger Philipp G.ORCID, Helleis Frank, Schuster Gerhard, Phillips Gavin J.ORCID, Lelieveld JosORCID, Crowley John N.ORCID
Abstract
Abstract. 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.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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