What is ORP?
How does an ORP electrode work?
What are some common ORP applications
Can I calibrate an ORP electrode?
Is Gold or Platinum better as an ORP sensor?
In which applications are silver electrodes commonly used?
ORP is short for "Oxidation Reduction Potential". It is simply a measure of the total oxiding or reducing power in a given solution. Oxidising agents will give positive mV readings such as chlorine and ozone, whereas reducing agents will give more negative mV values. A practical example is using ORP for disinfection control in a pool; a value of at least +650mV indicates that it is safe to swim in.
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An ORP electrode uses an inert metal such as Platinum or Gold as the sensing element. The metal surface serves as the surface where electron transfer takes place. Like pH and Ion selective electrode measurements, ORP electrodes are available with either as a combination probe, or used with a separate reference electrode.
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Common applications include disinfection control in pools and cooling towers and environmental monitoring of waters
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ORP electrodes give an absolute mV reading, and are not calibrated like a pH electrode. However, one can check the performance of an ORP electrode by measurement in commercially available ORP standards such as Lights Solution, Zobells, or Quinhydrone
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Generally Platinum is used, however Gold is preferred in certain application such as in Cyanide solutions. For more information click here.
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The IJAg is a combined silver electrode, and is most commonly used to determine the amounts of chloride/salt by argentimetric titration. It can also be used to determine the amount of silver in plating baths, silver fineness, and for determining cyanide. For more information click here.
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