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Article Dans Une Revue Atmospheric Measurement Techniques Année : 2017

Measurement of alkyl and multifunctional organic nitrates by proton-transfer-reaction mass spectrometry

Résumé

A commercial PTR-TOF-MS has been optimized in order to allow the measurement of individual organic nitrates in the atmosphere. This has been accomplished by shifting the distribution between different ionizing analytes, H 3 O + / H 3 O + (H 2 O) n or NO + / NO + 2. The proposed approach has been proven to be appropriate for the online detection of individual alkyl nitrates and functionalized nitrates. It has been shown that hydroxyl and ketonitrates have a high affinity towards NO + , leading to the formation of an adduct that allows the easy identification of the organic nitrate (R) from the R-NO + ion signal. The recorded sensitivities for both ionization modes correspond to detection limits of tens of ppt min −1 in the case of hydroxy-and ketonitrates. Alkyl nitrates exhibit a moderate affinity towards NO + ionization leading to detection units of few hundreds of ppt and the highest sensitivity in H 3 O + mode was obtained for the water adducts signals. However, this method exhibits much lower capabilities for the detection of peroxyacetyl nitrates with detection limits in the ppb range.
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Dates et versions

hal-04299742 , version 1 (22-11-2023)

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Marius Duncianu, Marc David, Sakthivel Kartigueyane, Manuela Cirtog, Jean-François Doussin, et al.. Measurement of alkyl and multifunctional organic nitrates by proton-transfer-reaction mass spectrometry. Atmospheric Measurement Techniques, 2017, 10 (4), pp.1445 - 1463. ⟨10.5194/amt-10-1445-2017⟩. ⟨hal-04299742⟩
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