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

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Abstract

A new optical sensor for fast screening of ammonium (NH 4 +) 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 NH 4 + ion determination with a storage period of one month. The quantification of NH 4 + 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 NH 4 + 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 NH 4 + ion sensor was 7.9 ppm NH 4 + 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 Fe 3+ ions, most common ions showed no serious interference. The sensor was also used for the determination of NH 4 + ion in river water and the results obtained were comparable to those obtained by a standard titrimetric method.

Original languageEnglish
Pages (from-to)614-619
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume173
DOIs
Publication statusPublished - Oct 2012

Fingerprint

Fiber optic sensors
Ammonium Compounds
reagents
optical fibers
Ions
solid state
reflectance
sensors
ions
optical measuring instruments
immobilization
Optical sensors
Sensors
nitrobenzenes
Nitrobenzene
spectrophotometry
ion concentration
Spectrophotometry
rivers
standard deviation

Keywords

  • Ammonium ion
  • Optical fibre
  • Optical sensor
  • p-Nitrobenzene-diazonium chloride
  • Reflectance spectrophotometry
  • XAD-7 beads

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "A new optical sensor for fast screening of ammonium (NH 4 +) 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 NH 4 + ion determination with a storage period of one month. The quantification of NH 4 + 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 NH 4 + 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 NH 4 + ion sensor was 7.9 ppm NH 4 + 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 Fe 3+ ions, most common ions showed no serious interference. The sensor was also used for the determination of NH 4 + ion in river water and the results obtained were comparable to those obtained by a standard titrimetric method.",
keywords = "Ammonium ion, Optical fibre, Optical sensor, p-Nitrobenzene-diazonium chloride, Reflectance spectrophotometry, XAD-7 beads",
author = "{Tan @ Chong}, {Ling Ling} and Musa Ahmad and Lee, {Yook Heng}",
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N2 - A new optical sensor for fast screening of ammonium (NH 4 +) 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 NH 4 + ion determination with a storage period of one month. The quantification of NH 4 + 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 NH 4 + 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 NH 4 + ion sensor was 7.9 ppm NH 4 + 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 Fe 3+ ions, most common ions showed no serious interference. The sensor was also used for the determination of NH 4 + ion in river water and the results obtained were comparable to those obtained by a standard titrimetric method.

AB - A new optical sensor for fast screening of ammonium (NH 4 +) 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 NH 4 + ion determination with a storage period of one month. The quantification of NH 4 + 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 NH 4 + 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 NH 4 + ion sensor was 7.9 ppm NH 4 + 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 Fe 3+ ions, most common ions showed no serious interference. The sensor was also used for the determination of NH 4 + ion in river water and the results obtained were comparable to those obtained by a standard titrimetric method.

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