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A liquid-membrane type nitrate-selective electrode was constructed, in which the responding membrane contained polyvinylchloride, o-nitrophenyloctylether and tetraheptylammonium nitrate. The NO 3  - -selective electrode displayed a linear response to the concentration of NO 3  - with a Nernstian slope of -53.3 ± 1.0 mV decade -1 , in the 10 -5 - 10 -1 mol dm -3 (M) NO 3  - concentration range. The NO 3  - detection limit was about 10 -6 M. The electrochemical response of this electrode was stable for more than 30 days. Measurements performed using the NO 3  - -sensor indicated that in the presence of green plants, the concentration of NO 3  - in a hydroponic solution decreased from 0.20 to 0.05 mM over a three-day period.

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