GC: n

CT: One way to quantify whether a substance is a strong oxidizing agent or a strong reducing agent is to use the oxidation-reduction potential or redox potential. Strong reducing agents can be said to have a high electron-transfer potential. Strong oxidizing agents have low electron-transfer potential. Oxidizing and reducing agents occur as couples, with a strong reducing agent coupled with a weak oxidizing agent and vice versa. Since these processes involve the transfer of electrons, the measurement of the resulting charge separation can be quantified in voltage measured between the couple and a standard hydrogen half-cell with 1 molar hydrogen and 1 atmosphere of hydrogen pressure on it. The redox potential of the hydrogen is zero at pH=0, but for tabulations a pH=7 is used for the hydrogen and under those conditions its redox potential is -0.421 volts.

S: http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/redoxp.html (last access: 26 February 2015)

N: 1. ORP is a term used frequently in the water treatment & food processing industry. ORP stands for Oxidation-Reduction Potential. So what is that? The best definition I can give is that “ORP is a measure of the cleanliness of the water & its ability to break down contaminants”. It has a range of –2,000 to + 2,000 and units are in “mV” (millivolts). Since ozone is an oxidizer, we are only concerned with positive ORP levels (above 0 mV).
ORP sensors work by measuring the dissolved oxygen. More contaminants in the water result in less dissolved oxygen because the organics are consuming the oxygen and therefore, the lower the ORP level. The higher the ORP level, the more ability the water has to destroy foreign contaminants such as microbes, or carbon based contaminants. The chart on the left identifies ORP levels for various applications.
2. … the voltage obtainable between an inert electrode placed in the environment and a normal hydrogen electrode, regardless of the particular substances present in the environment.
3. The more positive the potential the more oxidizing the environment, and the more negative the potential the more reducing the environment.
4. oxidation reduction potential (ORP); redox potential: terms and abbreviation standardized by ISO.

S: 1. http://www.ozoneapplications.com/info/orp.htm (last access: 26 February 2015). 2, 3 & 4. TERMIUMPLUS.

OV: oxidation reduction potential

S: TERMIUMPLUS

SYN: ORP, redox potential, rH, Eh, E, oxydoreduction potential.

S: TERMIUMPLUS

CR: biomass energy, energy.