Babcock University Research Portal

RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL

Authors: ONIGBINDE ADEBAYO

Publication Type: Journal article

Journal:

ISSN Number:

Downloads

Views

Abstract

The effect of pressure variation on the methane/ammonia (CH4NH3) chemical ionization (CI) mass spectra of polyethylene glycol monoalkyl ethers, PEGMAE, was investigated. Gas chromatograpyhy mass spectrometer was used to obtain the CH4/NH3 chemical ionization mass spectra. The result revealed that the mass spectra obtained at P(0.1) show less but similar fragmentation to that obtained with CH4 CI and also include (M+18)+ ions. The mass spectra of P(0.01) contain essentially only (M+18)+ ion small amount of MH+ ions and (M+18)+ as the base peak. The MH+/M(+18)+ ratio increases with increasing n which may be due to formation of cyclic structures, additional stabilization of (M+18)+ adduct ions or solvation of the MH+ ions. The relative abundant of the MH+ ions was found to be much larger than that reported previously in the CH4 CI spectra of the same compounds. This indicate that there are significant amount of proton transfer occurring from NH4+ to the PEGMAE's. The formation of the adduct reagent ion NH4.NH3 (m/z 35) have been suggested to be ligand switching for bifunctional oxygenated compounds but it is not so for the PEGMAE's studied in this paper. CH4/NH3 and isobutane, i-C4H10 gases are of equal utility but better than CH4 for quantitation. The relative molar sensitivities, RMS, (EI and CI) for PEGMAE's increases linearly with increasing molecular polarizabilities.

Access to Documents

External Link
Download
Digital Object Identifier

Keywords

ONIGBINDE,A. . (0000). RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL, 0 (), 0-0.

ONIGBINDE,A. . "RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL" 0, no (), (0000): 0-0.

ONIGBINDE,A. and . (0000). RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL, 0 (), pp0-0.

ONIGBINDEA, . RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL. 0000, 0 ():0-0.

ONIGBINDE,ADEBAYO , . "RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL", 0 . (0000) : 0-0.

O.ADEBAYO , "RELATIVE MOLAR SENSITIVITIES AND METHANE/AMMONIA CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYETHYL" vol.0, no., pp. 0-0, 0000.

Access to Documents

Keywords

About Us

Admissions

Contact Us

Policies

ALUMNI

STUDENT POPULATION