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Abstract
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Article Information:
Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol Mono Alkyl Ethers
Adebayo O. Onigbinde, Burnaby Munson and Bamidele M.W. Amos-tautua
Corresponding Author: Adebayo O. Onigbinde
Submitted: June 13, 2012
Accepted: August 28, 2012
Published: March 11, 2013 |
Abstract:
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Polyethylene Glycol Monoalkyl Ethers, CxH2x+1 (OC2H4)n OH, (PEGMAE), are polar compounds like Polyethylene Glycols (PEG) and they undergo microbial degradation which produces toxic substances that are potentially dangerous to the environment. Therefore, the purpose of this study is to carry out proper identification and characterization of these compounds. The Electron Ionization (EI) and Chemical Ionization (CI) spectra of various PEGMAE were obtained by Gas Chromatography/Mass Spectrometry (GC/MS) and were used to identify and characterize these compounds. The characteristic cleavages in the EI and CI reactions of PEGMAEs were also studied. The results obtained showed that the methane CI mass spectra of the PEGMAE contain MH+ ions and fragment ions similar to those found in their EI mass spectra. The relative abundances of the MH+ ions are low, variable and increase with increasing sample size across the chromatographic peaks; but do not increase with increasing x or n. The base peaks of the low mass oligomers (x3) are PEG related (e.g., m/z 45, 59) but those of higher mass oligomers (x4) include the ion at m/z 63 (HOC2H4OH) H+ or m/z 107 (HO (C2H4O)2 H) H+. There are no (MH-H2O)+ ions or protonated dimer ions (n2, x2) in the spectra of PEGMAE. The Relative Molar Sensitivities (RMS) or the Relative Sensitivity per Gram (RSG) increases linearly with molecular polarizabilty or molecular weight with a non-zero intercept.
Key words: Electron, methane chemical ionization, polyethylene glycol ethers, , , ,
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Abstract
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Cite this Reference:
Adebayo O. Onigbinde, Burnaby Munson and Bamidele M.W. Amos-tautua, . Gas Chromatography/Electron Ionization Mass Spectrometric Analysis of Oligomeric Polyethylene Glycol Mono Alkyl Ethers. Research Journal of Applied Sciences, Engineering and Technology, (07): 2332-2339.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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