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• W2022793958 abstract "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." @default.
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• W2022793958 date "2012-10-01" @default.
• W2022793958 modified "2023-10-15" @default.
• W2022793958 title "Reflectance based optical fibre sensor for ammonium ion using solid-state Riegler's reagent" @default.
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• W2022793958 doi "https://doi.org/10.1016/j.snb.2012.07.066" @default.
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