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Characterization of the Axial Jet Separator with a CO2/Helium Mixture: Toward GC-AMS Hyphenation.
Salazar, G; Agrios, K; Eichler, R; Szidat, S.
Afiliação
  • Salazar G; Department of Chemistry and Biochemistry & Oeschger Centre for Climate Change Research, University of Bern , 3012 Bern, Switzerland.
  • Agrios K; Department of Chemistry and Biochemistry & Oeschger Centre for Climate Change Research, University of Bern , 3012 Bern, Switzerland.
  • Eichler R; Paul Scherrer Institute (PSI) , 5232 Villigen-PSI, Switzerland.
  • Szidat S; Paul Scherrer Institute (PSI) , 5232 Villigen-PSI, Switzerland.
Anal Chem ; 88(3): 1647-53, 2016 Feb 02.
Article em En | MEDLINE | ID: mdl-26652049
ABSTRACT
Development of interfaces for sample introduction from high pressures is important for real-time online hyphenation of chromatographic and other separation devices with mass spectrometry (MS) or accelerator mass spectrometry (AMS). Momentum separators can reduce unwanted low-density gases and introduce the analyte into the vacuum. In this work, the axial jet separator, a new momentum interface, is characterized by theory and empirical optimization. The mathematical model describes the different axial penetration of the components of a jet-gas mixture and explains the empirical results for injections of CO2 in helium into MS and AMS instruments. We show that the performance of the new interface is sensitive to the nozzle size, showing good qualitative agreement with the mathematical model. Smaller nozzle sizes are more preferable due to their higher inflow capacity. The CO2 transmission efficiency of the interface into a MS instrument is ∼ 14% (CO2/helium separation factor of 2.7). The interface receives and delivers flows of ∼ 17.5 mL/min and ∼ 0.9 mL/min, respectively. For the interfaced AMS instrument, the ionization and overall efficiencies are 0.7-3% and 0.1-0.4%, respectively, for CO2 amounts of 4-0.6 µg C, which is only slightly lower compared to conventional systems using intermediate trapping. The ionization efficiency depends on to the carbon mass flow in the injected pulse and is suppressed at high CO2 flows. Relative to a conventional jet separator, the transmission efficiency of the axial jet separator is lower, but its performance is less sensitive to misalignments.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies / Qualitative_research Idioma: En Revista: Anal Chem Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Suíça

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies / Qualitative_research Idioma: En Revista: Anal Chem Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Suíça