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 NO-selective electrode displayed a linear response to the concentration of NO with a Nernstian slope of -53.3 ± 1.