Version 1
: Received: 22 October 2018 / Approved: 23 October 2018 / Online: 23 October 2018 (05:44:42 CEST)
How to cite:
Louarn, E.; Adli-Idlibi, A.M.; Leprovost, J.; Héninger, M.; Mestdagh, H. Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis. Preprints2018, 2018100520. https://doi.org/10.20944/preprints201810.0520.v1
Louarn, E.; Adli-Idlibi, A.M.; Leprovost, J.; Héninger, M.; Mestdagh, H. Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis. Preprints 2018, 2018100520. https://doi.org/10.20944/preprints201810.0520.v1
Louarn, E.; Adli-Idlibi, A.M.; Leprovost, J.; Héninger, M.; Mestdagh, H. Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis. Preprints2018, 2018100520. https://doi.org/10.20944/preprints201810.0520.v1
APA Style
Louarn, E., Adli-Idlibi, A.M., Leprovost, J., Héninger, M., & Mestdagh, H. (2018). Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis. Preprints. https://doi.org/10.20944/preprints201810.0520.v1
Chicago/Turabian Style
Louarn, E., Michel Héninger and Hélène Mestdagh. 2018 "Evidence of Reactivity in the Membrane for the Unstable Monochloramine during MIMS Analysis" Preprints. https://doi.org/10.20944/preprints201810.0520.v1
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.
Keywords
MIMS; monochloramine; FTICR; chemical ionization; in-membrane reaction
Subject
Chemistry and Materials Science, Analytical Chemistry
Copyright:
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.
