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Construction of Nitrate-selective Electrodes and Monitoring of Nitrates in Hydroponic Solutions

A liquid-membrane type nitrate-selective electrode was constructed, in which the responding membrane contained polyvinylchloride, o-nitrophenyloctylether and tetraheptylammonium nitrate. The NO3−-selective electrode displayed a linear response to the concentration of NO3− with a Nernstian slope of −...

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Bibliographic Details
Published in:Analytical Sciences 2018/12/10, Vol.34(12), pp.1373-1377
Main Authors: FUKAO, Yuko, KITAZUMI, Yuki, KANO, Kenji, SHIRAI, Osamu
Format: Article
Language:English
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Summary:A liquid-membrane type nitrate-selective electrode was constructed, in which the responding membrane contained polyvinylchloride, o-nitrophenyloctylether and tetraheptylammonium nitrate. The NO3−-selective electrode displayed a linear response to the concentration of NO3− with a Nernstian slope of −53.3 ± 1.0 mV decade−1, in the 10−5 – 10−1 mol dm−3 (M) NO3− concentration range. The NO3− detection limit was about 10−6 M. The electrochemical response of this electrode was stable for more than 30 days. Measurements performed using the NO3−-sensor indicated that in the presence of green plants, the concentration of NO3− in a hydroponic solution decreased from 0.20 to 0.05 mM over a three-day period.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.18P333