Determination of nitrate ion levels in water samples by use of
an ion selective electrode. Many recent developments in
analytical measurement are based on methods utilizing ion
selective electrodes. In many applications, ion selective
electrode methods are being substituted for existing analytical
methods with resulting increases in efficiency and simplicity of
measurement. Ion selective electrodes are usually classified by
the type of ion-sensitive membrane used in their construction,
and by the ion for which they are selective. The membrane in a
solid-state electrode is a thin section of an inorganic crystal.
Liquid ion-exchange membranes consist of an inert porous plastic
substrate which is saturated with a water immiscible organic
solvent containing an inorganic salt of the ion be measured. A
glass membrane is a thin section of glass which is formulated to
be responsive to the ion of interest. The nitrate ion selective
electrode used in this experiment is of the liquid-membrane type
and can be used for th