Polycyclic aromatic hydrocarbons (PAHs) are USEPA regulated priority pollutants. Their low aqueous solubility requires very sensitive analytical methods for their detection, typically involving pre-concentration steps. Presented is the first demonstrated 'proof of concept' use of condensed phase membrane introduction mass spectrometry (CP-MIMS) coupled with direct liquid electron ionization (DEI) for the direct, on-line measurement of PAHs in aqueous samples. DEI is very well suited for the ionization of PAHs and other non-polar compounds, and is not significantly influenced by the co-elution of matrix components. Linear calibration data for low ppb levels of aqueous naphthalene, anthracene and pyrene is demonstrated, with measured detection limits of 4 ppb. Analytical response times (t10-90% signal rise) ranged from 2.8 minutes for naphthalene to 4.7 minutes for pyrene. Both intra and inter day reproducibility has been assessed (< 3 % and 5 % RSD, respectively). Direct measurements of ppb level PAHs spiked in a variety of real, complex environmental sample matrices is examined, including natural waters, sea waters, and a hydrocarbon extraction production waste water sample. For these spiked, complex samples, direct PAH measurement by CP-MIMS-DEI yielded minimal signal suppression from sample

Condensed Phase Membrane Introduction Mass Spectrometry with Direct Electron Ionization: On-line Measurement of PAHs in Complex Aqueous Samples

TERMOPOLI, VERONICA;FAMIGLINI, GIORGIO;PALMA, PIERANGELA;CAPPIELLO, ACHILLE;
2016-01-01

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are USEPA regulated priority pollutants. Their low aqueous solubility requires very sensitive analytical methods for their detection, typically involving pre-concentration steps. Presented is the first demonstrated 'proof of concept' use of condensed phase membrane introduction mass spectrometry (CP-MIMS) coupled with direct liquid electron ionization (DEI) for the direct, on-line measurement of PAHs in aqueous samples. DEI is very well suited for the ionization of PAHs and other non-polar compounds, and is not significantly influenced by the co-elution of matrix components. Linear calibration data for low ppb levels of aqueous naphthalene, anthracene and pyrene is demonstrated, with measured detection limits of 4 ppb. Analytical response times (t10-90% signal rise) ranged from 2.8 minutes for naphthalene to 4.7 minutes for pyrene. Both intra and inter day reproducibility has been assessed (< 3 % and 5 % RSD, respectively). Direct measurements of ppb level PAHs spiked in a variety of real, complex environmental sample matrices is examined, including natural waters, sea waters, and a hydrocarbon extraction production waste water sample. For these spiked, complex samples, direct PAH measurement by CP-MIMS-DEI yielded minimal signal suppression from sample
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2628026
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