Measurement of Hydroxy Carbonyls and Other Carbonyls in Ambient Air Using Pentafluorobenzyl Alcohol as a Chemical Ionization Reagent

1999 ◽  
Vol 71 (16) ◽  
pp. 3420-3427 ◽  
Author(s):  
Reggie S. Spaulding ◽  
Paul Frazey ◽  
Xin Rao ◽  
M. Judith Charles
Keyword(s):  
Chemical Ionization ◽  
Ambient Air ◽  
Chemical Ionization Reagent

Acrylonitrile: A new chemical ionization reagent

1989 ◽  
Vol 24 (6) ◽  
pp. 435-438 ◽  
Author(s):  
R. Srinivas ◽  
M. Vairamani ◽  
G. K. Viswanadha Rao ◽  
U. A. Mirza
Keyword(s):  
Chemical Ionization ◽  
Chemical Ionization Reagent

scholarly journals A Vacuum Ultraviolet Ion Source (VUV-IS) for Iodide-Chemical Ionization Mass Spectrometry: A Substitute for Radioactive Ion Sources

2020 ◽  
Author(s):  
Yi Ji ◽  
L. Gregory Huey ◽  
David J. Tanner ◽  
Young Ro Lee ◽  
Patrick R. Veres ◽  
...  
Keyword(s):  
Formic Acid ◽  
Methyl Iodide ◽  
Chemical Ionization ◽  
Vacuum Ultraviolet ◽  
Ambient Air ◽  
Radioactive Source ◽  
Ion Source ◽  
Ion Sources ◽  
Ionization Mass ◽  
Molecular Chlorine

Abstract. A new ion source (IS) utilizing vacuum ultraviolet (VUV) light is developed and characterized for use with iodide-chemical ionization mass spectrometers (I−-CIMS). The VUV-IS utilizes a compact krypton lamp that emits light in two wavelength bands corresponding to energies of ~10.0 and 10.6 eV. The VUV light photoionizes either methyl iodide (ionization potential, IP = 9.54 ± 0.02 eV) or benzene (IP = 9.24378 ± 0.00007 eV) to form cations and photoelectrons. The electrons react with methyl iodide to form I− which serves as the reagent ion for the CIMS. The VUV-IS is characterized by measuring the sensitivity of a quadrupole CIMS (Q-CIMS) to formic acid, molecular chlorine, and nitryl chloride under a variety of flow and pressure conditions. The sensitivity of the Q-CIMS, with the VUV-IS, reached up to ~700 Hz pptv−1, with detection limits of less than 1 pptv for a one minute integration period. The reliability of the Q-CIMS with a VUV-IS is demonstrated with data from a month long ground-based field campaign. The VUV-IS is further tested by operation on a high resolution time-of-flight CIMS (TOF-CIMS). Sensitivities greater than 25 Hz pptv−1 were obtained for formic acid and molecular chlorine, which were similar to that obtained with a radioactive source. In addition, the mass spectra from sampling ambient air was cleaner with the VUV-IS on the TOF-CIMS compared to measurements using a radioactive source. These results demonstrate that the VUV lamp is a viable substitute for radioactive ion sources on I−-CIMS systems for most applications. In addition, the VUV-IS can likely be extended to other reagent ions, such as SF6− which are formed from high IP electron attachers, by the use of absorbers such as benzene to serve as a source of photoelectrons.

Benzene as a selective chemical ionization reagent gas

1990 ◽  
Vol 25 (10) ◽  
pp. 497-502 ◽  
Author(s):  
Charles Allgood ◽  
Yi Lin ◽  
Yee-Chung Ma ◽  
Burnaby Munson
Keyword(s):  
Chemical Ionization ◽  
Chemical Ionization Reagent ◽  
Selective Chemical

Methyl nitrite as a low pressure chemical ionization reagent

1982 ◽  
Vol 54 (7) ◽  
pp. 1245-1247 ◽  
Author(s):  
W. D. Reents ◽  
R. C. Burnier ◽  
Robert B. Cody ◽  
Ben S. Freiser
Keyword(s):  
Chemical Ionization ◽  
Low Pressure ◽  
Methyl Nitrite ◽  
Chemical Ionization Reagent ◽  
Pressure Chemical Ionization ◽  
Pressure Chemical

A novel chemical ionization reagent ion for organic analytes: the aquachloromanganese(II) cation [ClMn(H2 O)+ ]

2012 ◽  
Vol 26 (8) ◽  
pp. 940-942 ◽  
Author(s):  
Putuma P. Gqamana ◽  
Penggao Duan ◽  
Mingkun Fu ◽  
Vanessa Gallardo ◽  
Hilkka I. Kenttämaa
Keyword(s):  
Chemical Ionization ◽  
Chemical Ionization Reagent ◽  
Organic Analytes

scholarly journals Improving the selectivity of non-polar alkanes, alkenes, and aromatic hydrocarbon compounds by the application of acetonitrile as a Cl reagent

2009 ◽  
Vol 7 (3) ◽  
pp. 312-316 ◽  
Author(s):  
Fadel Alwedian ◽  
Khalid Abu-Shandi
Keyword(s):  
Mass Spectrometry ◽  
Aromatic Hydrocarbon ◽  
Chemical Ionization ◽  
Membrane Introduction Mass Spectrometry ◽  
Fragment Ions ◽  
Chemical Ionization Reagent ◽  
High Detection ◽  
Specific Fragment ◽  
Selective Enhancement ◽  
Preconcentration Method

AbstractThe selective enhancement of membrane introduction mass spectrometry for non-polar alkanes, alkenes, and aromatic hydrocarbon compounds by the application of acetonitrile as a chemical ionization reagent was investigated. Acetonitrile Cl is able to produce specific fragment ions for many of the compounds test and this can be used to identify and quantify the parent neutrals. This method provided relatively high detection limits of the test compounds. This method could potentially be useful for analytical applications such as the detection of non-polar hydrocarbons for environmental studies if CH3CN Cl/MIMS is coupled with a preconcentration method.

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