Elimination of oxygen interference in the electrochemical detection of monochloramine, using in situ pH control at interdigitated electrodes

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dc.check.date2022-02-22
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
dc.contributor.authorSeymour, Ian
dc.contributor.authorO'Sullivan, Benjamin
dc.contributor.authorLovera, Pierre
dc.contributor.authorRohan, James F.
dc.contributor.authorO'Riordan, Alan
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderDepartment of Agriculture, Food and the Marine, Irelanden
dc.contributor.funderEuropean Regional Development Funden
dc.date.accessioned2021-07-08T10:52:19Z
dc.date.available2021-07-08T10:52:19Z
dc.date.issued2021-02-22
dc.date.updated2021-07-07T09:32:58Z
dc.description.abstractDisinfection of water systems by chloramination is a method frequently used in North America as an alternative to chlorination. In such a case, monochloramine is used as the primary chlorine source for disinfection. Regular monitoring of the residual concentrations of this species is essential to ensure adequate disinfection. An amperometric sensor for monochloramine would provide fast, reagent-free analysis; however, the presence of dissolved oxygen in water complicates sensor development. In this work, we used in-situ pH control as a method to eliminate oxygen interference by conversion of monochloramine to dichloramine. Unlike monochloramine, the electrochemical reduction of dichloramine occurs outside the oxygen reduction potential window and is therefore not affected by the oxygen concentration. Potential sweep methods were used to investigate the conversion of monochloramine to dichloramine at pH 3. The pH control method was used to calibrate monochloramine concentrations between 1 and 10 ppm, with a detection limit of 0.03 ppm. Tests were carried out in high alkalinity samples, wherein it was found that the sensitivity of this method effectively remained unchanged. Monochloramine was also quantified in the presence of common interferents (copper, phosphate, and iron) which also had no significant impact on the analysis.en
dc.description.sponsorshipScience Foundation Ireland and the Department of Agriculture, Food and Marine on behalf of the Government of Ireland (Grant 16/RC/3835 VistaMilk)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSeymour, I., O'Sullivan, B., Lovera, P., Rohan, J. F. and O'Riordan, A. (2021) 'Elimination of oxygen interference in the electrochemical detection of monochloramine, using in situ pH control at interdigitated electrodes', ACS Sensors, 6(3), pp. 1030-1038. doi: 10.1021/acssensors.0c02264en
dc.identifier.doi10.1021/acssensors.0c02264en
dc.identifier.eissn2379-3694
dc.identifier.endpage1038en
dc.identifier.issued3en
dc.identifier.journaltitleACS Sensorsen
dc.identifier.startpage1030en
dc.identifier.urihttps://hdl.handle.net/10468/11548
dc.identifier.volume6en
dc.language.isoenen
dc.publisherACS Publicationsen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/13/RC/2077/IE/CONNECT: The Centre for Future Networks & Communications/en
dc.rights© 2021, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sensors, after technical editing by the publisher. To access the final edited and published work see: https://doi.org/10.1021/acssensors.0c02264en
dc.subjectAmperometric sensoren
dc.subjectChlorine sensingen
dc.subjectHypochlorous aciden
dc.subjectIn situ pH controlen
dc.subjectInterdigitated electrode arrayen
dc.subjectWater quality monitoringen
dc.titleElimination of oxygen interference in the electrochemical detection of monochloramine, using in situ pH control at interdigitated electrodesen
dc.typeArticle (peer-reviewed)en
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