Redox potential

Redox potential (also known as oxidation/reduction potential, ORP, pE, ε, or Eh) is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. The redox potential is measured in volts (V), or millivolts (mV). Each species has its own intrinsic redox potential; for example, the more positive the reduction potential (in volts), the greater the species' affinity for electrons and tendency to be reduced.

Measurement

The redox potential of a system is measured by an electrode and a reference electrode. It is compared to the Standard hydrogen electrode which is arbitrarily given a potential of 0 volts.

Applications

Redox potential is used in many fields, including chemistry, biology, and environmental science. It is particularly important in microbiology, where it can influence the growth of bacteria and other microorganisms.

See also

• Electrochemical potential
• Electrochemistry
• Electrode potential
• Standard electrode potential

References

Redox potential Resources
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