1. How to "regenerate" ORP electrode
ORP measurements of electrodes (platinum or gold), the surface of which should be bright, and the response of the rough surface to the redox potential is much slower than the surface of the brighter electrode. In addition, when the ORP electrode is used for a long time, the surface of platinum or gold will also be polluted, which will lead to low measurement and slow response, so the electrode must be cleaned and activated.
(1) for inorganic pollutants, the electrode can be immersed in 0.1mol/L dilute hydrochloric acid for 30 minutes, cleaned in pure water, and then immersed in the electrode soaking solution for 6 hours.
(2) the pollution of organic oil and oil film can be cleaned with pure water after cleaning the platinum or gold surface with detergent and then soaked in the electrode soaking solution for 6 hours.
(3) the surface pollution of platinum is serious, and the oxide film is formed on the surface. The surface of platinum or gold can be polished with toothpaste, then cleaned with pure water, and then immersed in electrode soaking solution for 6 hours.
The ORP meter does not need to be calibrated when it is used, and it can be used directly. Only when the quality or test results of the ORP electrode are questioned, the ORP standard solution can be prepared to test its mV value to distinguish the good ring of the ORP electrode or instrument.
2. How to correctly understand the accuracy of the ORP value?
In the natural waters, there are many kinds of different valence ions and dissolved oxygen, when some industrial wastewater discharged into the water, the water contains a lot of ions and organic substances due to ion properties of different redox reaction and equilibrium in water, so the water in nature is not a single redox system, but the hybrid system a redox. The measured electrode is also a mixed potential, which has great experimental error. In addition, the pH value of the solution also affects the ORP value. Therefore, the redox potential is a solution for qualitative determination of redox ability, it is a reflection of the relative condition, or it can be said to be the reduction reaction equilibrium and reaction process of oxidation of a complete description of the trend and state level, and not a quantitative theoretical calculation. Therefore, it is meaningless to emphasize the absolute potential of the solution during the actual measurement. We can say that the ORP value of the solution that solution a reduction or oxidation state in the vicinity of a certain value, or that some properties of solutions (such as health level), but this value will be quite different, you can't make it to quantitatively determine the accuracy, this test is two and pH a concept. In addition, the temperature coefficient that affects the ORP value is also a variable, which can not be corrected. Therefore, the ORP meter generally does not have the function of temperature compensation.
What does 3, ORP (Redox) mean? What is the ORP plan?
ORP is the abbreviation of Oxidation-Reduction Potential in English, and Redox is the abbreviation of Reduction and Oxidation, which indicates the oxidation potential of the solution. The ORP value is the measurement index of the redox ability of water solution, and its unit is mV. The ORP meter is a special instrument for testing the redox potential of the solution. It is composed of a ORP composite electrode and a mV meter. ORP electrode is a kind of electrode that can absorb or release electrons on the surface of sensitive layer. The sensitive layer is inert metal, which is usually made of platinum and gold.