title: Direct Analysis of Oil Additives by High-Field Asymmetric Waveform Ion Mobility Spectrometry-Mass Spectrometry Combined with Electrospray Ionization and Desorption Electrospray Ionization.
abstract: The analysis of corrosion inhibitors in the presence and absence of an oil matrix is reported using electrospray ionization (ESI) and desorption electrospray ionization (DESI), hyphenated with miniaturized high-field asymmetric waveform ion mobility spectrometry (FAIMS) and mass spectrometry (MS). The target analytes were successfully ionized in solution by ESI and directly from steel surfaces using DESI ambient ionization at levels ≥0.0004% w/w (4 ppm) in oil. Differences in the mass spectral profiles observed for the additive/oil mixture are attributed to differences between the ESI and DESI ionization processes. The use of FAIMS improved selectivity for ESI generated analyte ions through reduction in the chemical noise resulting from the oil matrix. DESI enabled the direct, rapid, native state interrogation of oil samples on steel surfaces without sample pretreatment, and the hyphenation of DESI with the miniaturized FAIMS enhanced the relative analyte responses of the surface-active corrosion inhibitors.
authors.affiliation: Centre for Analytical Science, Department of Chemistry, Loughborough University , Leicestershire, LE11 3TU, United Kingdom.
authors.forename: Caitlyn
authors.initials: C
authors.lastname: Da Costa
authors.affiliation: Centre for Analytical Science, Department of Chemistry, Loughborough University , Leicestershire, LE11 3TU, United Kingdom.
authors.forename: Matthew
authors.initials: M
authors.lastname: Turner
authors.affiliation: Centre for Analytical Science, Department of Chemistry, Loughborough University , Leicestershire, LE11 3TU, United Kingdom.
authors.forename: James C
authors.initials: JC
authors.lastname: Reynolds
authors.affiliation: BP Formulated Products Technology , Whitchurch Hill, Pangbourne, Reading, RG8 7QR, United Kingdom.
authors.forename: Samuel
authors.initials: S
authors.lastname: Whitmarsh
authors.affiliation: BP Formulated Products Technology , Whitchurch Hill, Pangbourne, Reading, RG8 7QR, United Kingdom.
authors.forename: Tom
authors.initials: T
authors.lastname: Lynch
authors.affiliation: Centre for Analytical Science, Department of Chemistry, Loughborough University , Leicestershire, LE11 3TU, United Kingdom.
authors.forename: Colin S
authors.initials: CS
authors.lastname: Creaser