Questions regarding oxidation-reduction potential (ORP)

There is little information available on the forum; see http://bbs.hcbbs.com/viewthread.php?tid=72592&highlight=ORP

ORP: Oxidation-reduction potential, measured in mV. It indicates the discharge potential of ClO-, with the level of potential reflecting the concentration of ClO-. For brine, this value is <50 mV; for weakly saline water, it is <100 mV. The electrodes on the inside are made of platinum or platinum alloys; it is recommended to use imported ones, which are also commonly used for calibration.

Insert the measurement electrode into the system to be measured. (Ion-exchange membrane anolyte); the oxidation or reduction capacity of this system (the oxidation capacity of the anolyte) corresponds to the potential of the half-cell. The potential measured by combining it with a standard hydrogen electrode is the redox potential of that system.

The application of electrodes is related to temperature. Installation requires a cooling system, and the flow rate must meet the measurement requirements. Prone to damage.

The ORP value is not an absolute value; factors such as temperature and pH affect its magnitude. With different conditions, the same ORP value is not comparable.

We have them too, but I think they can only be used as a reference – they’re not very accurate. In theory, they are supposed to measure the amount of oxidizing or reducing substances in saline or slightly salty water, but in practice the results aren’t very satisfactory; the same is true for those made by foreigners.

The ORP value is a measure of the redox capacity of an aqueous solution, with units of mV. An ORP meter is a specialized instrument for measuring the redox potential of solutions; it consists of an ORP composite electrode and an mV meter. An ORP electrode is a type of electrode that can absorb or release electrons at the surface of its sensitive layer, which is an inert metal, usually made of platinum or gold. The reference electrode is a silver/silver chloride electrode, the same as the pH electrode.

In my opinion, the ORP value is a scientific method for measuring the redox capacity of aqueous solutions; it can reflect the oxidation and reduction properties of these solutions. Issues such as damage and calibration are merely minor drawbacks of this method, and they do not overshadow its major advantage of enabling the assessment of the solution’s state characteristics.

ORP is the abbreviation for O*dation-Reduction Potential in English, and it represents the redox potential of a solution. The ORP value is a measure of the redox capacity of an aqueous solution, with units of mV. It consists of an ORP composite electrode and a millivoltmeter. An ORP electrode is a type of electrode that can absorb or release electrons at the surface of its sensitive layer, which is an inert metal, usually made of platinum or gold. The reference electrode is a silver/silver chloride electrode, the same as the pH electrode. 1. Redox electrodes can be used with any pH/mV meter. 　　2. The ORP meter does not require calibration and can be used directly. Only when there are doubts about the quality of the ORP electrode or the test results, can an ORP standard solution be used to check whether the potential falls within the range of 200–275 mV, in order to determine the condition of the ORP electrode or the instrument. Instruction Manual for Redox Electrodes Instruction Manual for Redox Electrodes Instruction Manual for Redox Electrodes 3. The ORP measuring electrode (platinum or gold) should have a smooth surface; a rough or contaminated surface can affect the electrode’s potential in mv. It can be cleaned and activated using the following methods. 　　(1) For inorganic contamination, the electrode can be immersed in 0.1 mol/L dilute hydrochloric acid for 30 minutes, washed with pure water, then immersed in a 3.5 MOL/L potassium chloride solution for 6 hours before use. 　　(2) For organic oil and oil film contamination, the platinum or gold surface can be cleaned with detergent, followed by rinsing with pure water; after that, it should be immersed in a 3.5 MOL/L potassium chloride solution for 6 hours before use. 　　(3) If the surface of platinum is severely contaminated and an oxide film forms, the surface of platinum or gold can be polished using toothpaste, then cleaned with pure water, and subsequently immersed in a 3.5 MOL/L potassium chloride solution for 6 hours before use.