Next Article in Journal
Design of User-Customized Negative Emotion Classifier Based on Feature Selection Using Physiological Signal Sensors
Next Article in Special Issue
Sensory Polymeric Foams as a Tool for Improving Sensing Performance of Sensory Polymers
Previous Article in Journal
Design and Analysis of a General Relay-Node Selection Mechanism on Intersection in Vehicular Networks
Article Menu

Export Article

Open AccessArticle
Sensors 2018, 18(12), 4252;

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

Laboratoire de Chimie Physique, UMR 8000, CNRS et Université Paris Sud, 91405 Orsay, France
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)
Full-Text   |   PDF [1636 KB, uploaded 13 December 2018]   |  


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

Graphical abstract

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).

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top