From Advanced Sensor Technologies, Inc.

The following procedure will provide the user with concentration of thiocyanate iions in most water sources. The only limitation is the sample be free of sulfide, mercury, and iodine ions. Sample Standardization: Add 100 ml of sample solution and 2 ml of ISA solution to a 150 ml beaker. Place electrodes in the solution to a minimum depth of one inch. Read stable electrode potential in millivolts and record E3.
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Oxidation Reduction Potential (ORP) Electrodes
Oxygen reduction potential (ORP) electrodes are analytical sensors for measuring oxidation-reduction potential (ORP).
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Ion selective electrodes measure the potential of a specific ion in solution. This potential is measured against a stable reference electrode of constant potential.
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Ion specific electrode meters are millivolt meters that interface with ion selective electrodes (ISEs). These meters take the potential generated by the electrode and convert it into units of concentration.

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