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A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water

One of the major problems in the analysis of ammonia (NH 3) using spectrophotometric method is highly coloured water sample. A reflectometric NH 3 sensor based on a facile single-step immobilisation of cobalt(II) (Co 2+) ion onto high capacity Dowex HCR-W2 microspheres has been developed to enable t...

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Main Authors: L.L, Tan,, M., Ahmad,, Y.H., Lee,
Format: Article
Language:en_US
Published: 2015
Subjects:
Ammonia
Dowex HCR-W2
Hexamminecobaltate(II) complex
Immobilised cobalt(II) ion
Optode
Reflectometric
Online Access:http://ddms.usim.edu.my/handle/123456789/8491
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spelling my.usim-84912017-02-23T04:50:31Z A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water L.L, Tan, M., Ahmad, Y.H., Lee, Ammonia Dowex HCR-W2 Hexamminecobaltate(II) complex Immobilised cobalt(II) ion Optode Reflectometric One of the major problems in the analysis of ammonia (NH 3) using spectrophotometric method is highly coloured water sample. A reflectometric NH 3 sensor based on a facile single-step immobilisation of cobalt(II) (Co 2+) ion onto high capacity Dowex HCR-W2 microspheres has been developed to enable the direct NH 3 determination in highly coloured water samples. The combination of Co 2+ ion-immobilised microspheres via cation exchange chemical reaction and reflectometric technique has improved the optode sensing performance with respect to linear response range and response time. Immobilised Co 2+ ion, when complexed with NH 3 gave a blue colouration of hexamminecobaltate(II) ([Co(NH 3) 6] 2+) complex at pH 13. The NH 3 sensor reached maximum colour intensity in ∼6 min at ambient conditions. The linear calibration curve was 60-290 mM NH 3 with a detection limit of 16 mM NH 3, which is suitable for direct determination of NH 3-enriched leachate water samples. A good reproducibility between 5.4 and 5.9% relative standard deviation (RSD) was obtained with the probe and the sensing performance can be regenerated using buffer pH 1. The effect of potential interference ions has been investigated during the quantification of NH 3 in heavily polluted sewage water. The results obtained were in good agreement with those produced by acidimetric reference method. © 2012 Published by Elsevier B.V. 2015-06-25T02:42:52Z 2015-06-25T02:42:52Z 2012 Article 9254005 http://ddms.usim.edu.my/handle/123456789/8491 en_US
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 en_US
topic Ammonia
Dowex HCR-W2
Hexamminecobaltate(II) complex
Immobilised cobalt(II) ion
Optode
Reflectometric
spellingShingle Ammonia
Dowex HCR-W2
Hexamminecobaltate(II) complex
Immobilised cobalt(II) ion
Optode
Reflectometric
L.L, Tan,
M., Ahmad,
Y.H., Lee,
A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
description One of the major problems in the analysis of ammonia (NH 3) using spectrophotometric method is highly coloured water sample. A reflectometric NH 3 sensor based on a facile single-step immobilisation of cobalt(II) (Co 2+) ion onto high capacity Dowex HCR-W2 microspheres has been developed to enable the direct NH 3 determination in highly coloured water samples. The combination of Co 2+ ion-immobilised microspheres via cation exchange chemical reaction and reflectometric technique has improved the optode sensing performance with respect to linear response range and response time. Immobilised Co 2+ ion, when complexed with NH 3 gave a blue colouration of hexamminecobaltate(II) ([Co(NH 3) 6] 2+) complex at pH 13. The NH 3 sensor reached maximum colour intensity in ∼6 min at ambient conditions. The linear calibration curve was 60-290 mM NH 3 with a detection limit of 16 mM NH 3, which is suitable for direct determination of NH 3-enriched leachate water samples. A good reproducibility between 5.4 and 5.9% relative standard deviation (RSD) was obtained with the probe and the sensing performance can be regenerated using buffer pH 1. The effect of potential interference ions has been investigated during the quantification of NH 3 in heavily polluted sewage water. The results obtained were in good agreement with those produced by acidimetric reference method. © 2012 Published by Elsevier B.V.
format Article
author L.L, Tan,
M., Ahmad,
Y.H., Lee,
author_facet L.L, Tan,
M., Ahmad,
Y.H., Lee,
author_sort L.L, Tan,
title A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
title_short A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
title_full A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
title_fullStr A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
title_full_unstemmed A novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
title_sort novel optical ammonia sensor based on reflectance measurements for highly polluted and coloured water
publishDate 2015
url http://ddms.usim.edu.my/handle/123456789/8491
_version_ 1645152427834343424
score 13.222552

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