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Sensors 2018, 18(12), 4252; https://doi.org/10.3390/s18124252

Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis

1
Laboratoire de Chimie Physique, UMR 8000, CNRS et Université Paris Sud, 91405 Orsay, France
2
AlyXan, Centre Hoche, 3 Avenue Condorcet, 91260 Juvisy-sur-Orge, France
*
Author to whom correspondence should be addressed.
Received: 13 November 2018 / Revised: 29 November 2018 / Accepted: 30 November 2018 / Published: 3 December 2018
(This article belongs to the Special Issue Polymers Based Sensors)
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Abstract

Membrane Inlet Mass Spectrometry (MIMS) was used to analyze monochloramine solutions (NH2Cl) and ammonia solutions in a compact FTICR. Chemical ionization enables identification and quantification of the products present in the permeate. The responses of protonated monochloramine and ammonium increase linearly with the solution concentration. The enrichments were respectively 1.2 and 5.5. Pervaporation is dependent on pH and only the basic form of ammonia NH3 pervaporates through the membrane. Unexpectedly, the small ammonia molecule permeated very slowly. It could be due to interactions with water molecules inside the membrane that create clusters. Moreover, NH2Cl solutions, in addition to the NH3Cl+ signal, presented a strong NH4+ signal at m/z 18.034. Ammonia presence in the low-pressure zone before ionization is probable as NH4+ was detected with all the precursors used, particularly CF3+ and trimethylbenzene that presents a proton affinity higher than monochloramine. Ammonia may be formed inside the membrane due to the fact that NH2Cl is unstable and may react with the water present in the membrane. Those results highlight the need for caution when dealing with chloramines in MIMS and more generally with unstable molecules. View Full-Text
Keywords: MIMS; monochloramine; FTICR; chemical ionization; in-membrane reaction; PTRMS; CIMS MIMS; monochloramine; FTICR; chemical ionization; in-membrane reaction; PTRMS; CIMS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Louarn, E.; Asri-Idlibi, A.M.; Leprovost, J.; Héninger, M.; Mestdagh, H. Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis. Sensors 2018, 18, 4252.

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