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

A 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 ha...

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Main Authors: Tan Ling, Ling,, Musa, Ahmad,, Lee Yook, Heng,
Format: Article
Language:English
Published: Elsevier Science Sa 2015
Subjects:
Optical Sensor
Ammonium Ion
XAD-7 Beads
P-Nitrobenzene-Diazonium Chloride
Reflectance Spectrophotometry
Optical Fibre
Online Access:http://ddms.usim.edu.my/handle/123456789/8389
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spelling my.usim-83892017-02-23T04:50:56Z Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent Tan Ling, Ling, Musa, Ahmad, Lee Yook, Heng, Optical Sensor Ammonium Ion XAD-7 Beads P-Nitrobenzene-Diazonium Chloride Reflectance Spectrophotometry Optical Fibre A 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. 2015-06-16T03:49:35Z 2015-06-16T03:49:35Z 2012 Article 0925-4005 http://ddms.usim.edu.my/handle/123456789/8389 en Elsevier Science Sa
institution Universiti Sains Islam Malaysia
building USIM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universit Sains Islam i Malaysia
content_source USIM Institutional Repository
url_provider http://ddms.usim.edu.my/
language English
topic Optical Sensor
Ammonium Ion
XAD-7 Beads
P-Nitrobenzene-Diazonium Chloride
Reflectance Spectrophotometry
Optical Fibre
spellingShingle Optical Sensor
Ammonium Ion
XAD-7 Beads
P-Nitrobenzene-Diazonium Chloride
Reflectance Spectrophotometry
Optical Fibre
Tan Ling, Ling,
Musa, Ahmad,
Lee Yook, Heng,
Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
description A 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.
format Article
author Tan Ling, Ling,
Musa, Ahmad,
Lee Yook, Heng,
author_facet Tan Ling, Ling,
Musa, Ahmad,
Lee Yook, Heng,
author_sort Tan Ling, Ling,
title Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
title_short Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
title_full Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
title_fullStr Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
title_full_unstemmed Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent
title_sort reflectance based optical fibre sensor for ammonium ion using solid-state riegler's reagent
publisher Elsevier Science Sa
publishDate 2015
url http://ddms.usim.edu.my/handle/123456789/8389
_version_ 1645152407836950528
score 13.222552

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