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Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent

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dc.contributor.authorLing, TLen_US
dc.contributor.authorAhmad, Men_US
dc.contributor.authorHeng, LYen_US
dc.date.accessioned2024-05-29T02:54:07Z
dc.date.available2024-05-29T02:54:07Z
dc.date.issued2012
dc.description.abstractA new optical sensor for fast screening of ammonium (NH4+) ion was developed based on immobilisation of p-nitrobenzene-diazonium chloride (Riegler's reagent) onto XAD-7 microbeads. In aqueous solution, the diazonium salt is unstable and will spontaneously decompose at room temperature but we have successfully stabilised this compound via immobilisation using physical adsorption to create a solid-state Riegler's reagent for NH4+ ion determination with a storage period of one month. The quantification of NH4+ ion concentration was possible by using reflectance spectrophotometry method with an optical fibre probe. The solid-state Riegler's reagent based optical sensor yielded a wide linear response range for NH4+ ion of 10-60 ppm and a fast response time of 2 min when compared with many commonly used coloured reagents. The limit of detection (LOD) of the optical NH4+ ion sensor was 7.9 ppm NH4+ ion with optimum response at pH 7. The response of the sensor was reproducible (4.2-5.7% relative standard deviation, n = 3) and can be regenerated using buffer pH 1. Except for Fe3+ ions, most common ions showed no serious interference. The sensor was also used for the determination of NH4+ ion in river water and the results obtained were comparable to those obtained by a standard titrimetric method. (c) 2012 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.snb.2012.07.066
dc.identifier.epage619
dc.identifier.issn0925-4005
dc.identifier.scopusWOS:000311248100087
dc.identifier.spage614
dc.identifier.urihttps://oarep.usim.edu.my/handle/123456789/11445
dc.identifier.volume173
dc.languageEnglish
dc.language.isoen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofSensors And Actuators B-Chemical
dc.sourceWeb Of Science (ISI)
dc.subjectOptical sensoren_US
dc.subjectAmmonium ionen_US
dc.subjectXAD-7 beadsen_US
dc.subjectp-Nitrobenzene-diazonium chlorideen_US
dc.subjectReflectance spectrophotometryen_US
dc.subjectOptical fibreen_US
dc.titleReflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
dc.typeArticleen_US
dspace.entity.typePublication

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