Atmospheric pressure photoionization mass spectrometry of fullerenes.

Détails

ID Serval
serval:BIB_E1FE7371237C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Atmospheric pressure photoionization mass spectrometry of fullerenes.
Périodique
Analytical chemistry
Auteur(s)
Núñez O., Gallart-Ayala H., Martins C.P., Moyano E., Galceran M.T.
ISSN
1520-6882 (Electronic)
ISSN-L
0003-2700
Statut éditorial
Publié
Date de publication
19/06/2012
Volume
84
Numéro
12
Pages
5316-5326
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
Atmospheric pressure photoionization (APPI) was evaluated for the analysis of fullerenes. An important response improvement was found when using toluene mediated APPI in negative mode if compared with other atmospheric pressure ionization (API) sources (electrospray and atmospheric pressure chemical ionization). Fullerene APPI negative mass spectra were dominated by the isotopic cluster of the molecular ion, although isotopic patterns for M+1, M+2, and M+3 ions showed higher than expected relative abundances. These discrepancies are explained by the presence of two isobaric ions, one due to (13)C and the other due to the addition of hydrogen to a double bond of the fullerene structure. Triple quadrupole tandem mass spectrometry, ultrahigh resolution mass spectrometry, and accurate mass measurements were used to confirm these assignments. Additionally, cluster ions M+16 and M+32 were characterized following the same strategy. Ions due to the addition of oxygen and alkyl additions were attributed to the presence of methanol in the mobile phase. For the fast chromatographic separation of fullerenes (less than 3.5 min), a sub-2 μm C18 column and isocratic elution (toluene/methanol, 45:55 v/v) was used. Highly selective-selected ion monitoring (H-SIM) mode (mass resolving power, >12,500 fwhm) was proposed monitoring the two most intense isotope ions in the [M](-•) cluster. Method limits of quantitation down to 10 pg L(-1) for C(60) and C(70) fullerenes and between 0.75 and 5.0 ng L(-1) for larger fullerenes were obtained. Finally, the ultrahigh performance liquid chromatography (UHPLC)-APPI-MS method was used to analyze fullerenes in river and pond water samples.

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Création de la notice
02/06/2017 13:28
Dernière modification de la notice
21/08/2019 5:34
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