The nitrate ISE is a liquid membrane sensing electrode made with an ionophore impregnated into PVC. The electrode functions as a sensor or ionic conductor and produces a potential change due to changes in the sample’s ion activity. When the ionic strength of the sample is fixed by the addition of ISA, the voltage is proportional to the concentration of nitrate ions in solution and the electrode follows the Nernst equation.
The Nitrate ISE is available as a combination version with both indicating half-cell and reference half-cell. It is also available as an indicating half-cell that will be used with a separate reference half-cell. The reference half-cell with the skirted cone geometry is the preferred version to use.