Pollution Control of Nitrate-selective Membrane by the Inner Solution and On-site Monitoring of Nitrate Concentration in Soil.

A liquid-membrane type nitrate-selective electrode was improved to lower the influence of contaminants by modifying its inner electrode system from Ag | AgCl | Cl to Ag | Ag. The NO-selective electrode displayed a linear response to the concentration of NO with a Nernstian slope of -53 ± 1 mV decade, in the concentration region between 10 and 2 mol dm (M). The NO detection limit was about 10 M.