Oxidation Reduction Potential (ORP)

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Published Date Written by Sharon Banks

 ORP stands for oxidation-reduction potential and is a measure, in millivolts, of the tendency (potential) of a chemical substance to either lose or gain electrons when subjected to change by the introduction of another chemical species.

The typical purpose of determining ORP is to ensure that a reaction has gone to completion, i.e., the substance of interest has been completely reduced or completely oxidized. ORP is used for monitoring and controlling drinking water, swimming pools and spas. However, ORP is also used for cooling tower disinfection, groundwater remediation, bleaching, cyanide destruction, chrome reductions, metal etching, fruit and vegetable disinfection and dechlorination.

ORP is also measured, in some instances, for the control of biological growth. In tests on polio virus, E. coli, and other organisms, a direct correlation between ORP and the rate of inactivation was determined. The principle behind the applications is that a minimum ORP value will successfully destroy micro-organisms.

UIS Analytical Services has an ISO/IEC 17025 SANAS accredited and dedicated environmental division where daily ORP analyses are carried out on various borehole and surface water samples. Please contact us should you require additional information on this article or any other water parameter.

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