期刊
ANALYTICAL CHEMISTRY
卷 82, 期 17, 页码 7302-7308出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac101253n
关键词
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资金
- Robert A. Welch Foundation [A-1417]
- U.S. National Science Foundation [AGS-0938352, CBET-0932705]
- National Natural Science Foundation of China [40728006]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0938352] Funding Source: National Science Foundation
This paper describes atmospheric pressure-ion drift chemical ionization mass spectrometry (AP-ID-CIMS) for monitoring of ambient trace species. Operation of the drift tube at atmospheric pressure allows a significantly longer ion molecule reaction time and eliminates dilution of the ambient samples, while a well-defined electric field inside the drift tube provides the benefits to confine the flight path and velocity of reagent/product ions, to break down ion clusters, and to control the ion-molecule reaction time. The AP-ID-CIMS exhibits advantages over the conventional low pressure ID-CIMS and flow tube AP-CIMS, improving the detection sensitivity by 3 orders of magnitude and a factor of 3, respectively. We demonstrate that the AP-ID-CIMS allows quantification of sulfuric acid concentrations and is capable of detecting gaseous sulfuric acid with a detection limit of less than 10(5) molecules cm(-3), on the basis of 3 sigma of the baseline noise and an integration time of 12 s. A field evaluation of the AP-ID-CIMS is presented for ambient H2SO4 measurements.
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