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I. Overview Oxidation reduction potential (ORP) as a comprehensive indicator of the environmental conditions of the medium (including soil, natural water, culture medium, etc.) has been used for a long time, which characterizes the relative degree of oxidative or reductive properties of the medium. The redox potential has long been measured directly using a platinum electrode. The platinum electrode and the reference electrode are directly inserted into the medium for measurement. However, when measuring a weakly balanced system, since the platinum electrode is not absolutely inert, an oxide film or other substance may be formed on the surface. Affecting the electron exchange rate of each redox couple on the platinum electrode, the establishment of the equilibrium potential is extremely slow, and it takes several hours or even one or two days in some media, and the measurement error is very large, usually 40-100 mV. If the surface properties of the platinum electrode and the kinetics of the electrode potential are fully considered, for a complex medium, if the deoxidation method is used to determine the redox potential, a more accurate result can be obtained within a shorter time of 3 minutes, usually Less than 10mV or better. Oxidation-reduction potential (ORP) depolarization method Fully automatic measuring instrument can measure the pH value of the sample in addition to the deoxidation method to measure the oxidation-reduction potential, which is convenient for the actual system measurement. Second, the pH measurement principle indicator electrode, reference electrode and test liquid constitute a measurement battery. When the pH/pX value changes, the potential of the indicating electrode changes, and the potential of the reference electrode does not change. They are in accordance with the relationship between the potential E and the ion activity in the Nernst equation. Measuring the pH of the solution uses a pH indicating electrode, which is a dedicated sensor for measuring pH. When measuring pH, the instrument calibrates the pH electrode based on two standard solution values ​​and corresponding electrode potential values. The shape of the instrument is shown in the figure. 3. Depolarization method Oxidation reduction potential measurement The polarization voltage is adjusted to 600 to 750 mV, the silver-silver chloride electrode is used as the auxiliary electrode, the platinum electrode is connected to the positive end of the power source, and the anode is polarized (polarization time is more than 10 seconds) Freely selected), then cut off the polarized power supply (depolarization time is free to choose above 20 seconds), monitor the potential of the platinum electrode (for the calomel electrode) during depolarization. There is a linear relationship between the internal electrode potential E (millivolts) and the logarithm of the depolarization time logt. Cathodic polarization and subsequent depolarization monitoring were performed in the same manner. The intersection of the anode depolarization curve and the extension line of the cathodic depolarization curve corresponds to the equilibrium potential. The equation of the two curves is solved to obtain the equilibrium potential. When the equilibrium potential is added to the potential value of the reference electrode at this temperature, the ORP value can be obtained. By inputting data about the two depolarization curves into the computer, the ORP value of the soil is automatically calculated. However, the operation is tight during the manual measurement process, and the mathematical processing is cumbersome. Fourth, the main technical indicators and main functions: 1, measuring range: pH: 0-14pH; minimum reading is 0.01pH; accuracy is 0.02 pH ± 1 word; mV: 0-±1999mV, minimum reading 1mV; 2, pH measurement The input impedance is 31'1012 ohms. 3, can get more accurate results within 2 minutes of a short time, usually supporting measurements less than 10mV or better. 4. The temperature measurement range is -10-+100°C; the resolution is 0.1°C, the accuracy is ±0.25°C at room temperature, and the full scale is ±0.75°C; 5. The main functions are: (1), automatic control of polarization time; (2), automatic control of depolarization time; (3), automatic data acquisition; (4), automatic polarity replacement; (5), automatic temperature compensation calomel electrode potential; (6), automatic data processing. It not only improves the measurement accuracy, but also improves work efficiency and labor intensity. The redox potential (ORP) depolarization method is a fully automated measurement system consisting of an electrode part (platinum electrode, saturated calomel electrode, silver-silver chloride electrode and temperature sensor), small hardware components (hereinafter referred to as instrument), single chip microcomputer and application. Software composition. It can be used indoors or in the field; it can be used independently or in combination with a PC; it can be used for single measurement or cyclic data acquisition. When used independently, you can print and save the measurement results. The maximum number of results that can be saved is 400. The saved measurement results can be uploaded to the PC. A new instrument is provided for the determination of ORP.
September 23, 2021