How the dissolved oxygen electrode measures dissolved oxygen content. The dissolved oxygen meter electrode can be used to measure the dissolved oxygen content in the aqueous solution of the test sample in the field or in the laboratory. The content of dissolved oxygen in the article refers to the content of oxygen dissolved in an aqueous solution. Oxygen is dissolved in water by the surrounding air, air flow, and photosynthesis. The oxygen content in water mainly depends on the temperature. The warm oxygen concentration is lower than cold water. The natural stream purification process requires proper oxygen content to provide aerobic life forms. If the oxygen content in the water is lower than 5.0 mg/L, survival of aquatic organisms is difficult, and the lower the concentration, the more difficult it is. If the oxygen content is below 1-2 mg/L and persists for a few hours, the aquatic organisms will die in large numbers.
The dissolved oxygen electrode uses a membrane to separate the platinum cathode, the silver anode, and the electrolyte from the outside. In general, the cathode is in direct contact with this membrane. Oxygen diffuses through the membrane at a ratio proportional to its partial pressure, and the higher the oxygen partial pressure, the more oxygen passes through the membrane. When dissolved oxygen penetrates the membrane continuously and penetrates into the cavity, it is reduced at the cathode to generate a current. This current is displayed on the meter. Since this current is directly proportional to the dissolved oxygen concentration, the calibration instrument simply converts the measured current to concentration units.
SECCO's environmentally-friendly dissolved oxygen electrode can be widely used to measure the dissolved oxygen content in various situations. It can be used to monitor the oxygen content which will affect the reaction speed, process efficiency, or environment, especially the cultivation of water, photosynthesis and respiration. Role and site measurement, environmental testing (lakes, streams, oceans), water/wastewater treatment, wine production, etc. In assessing the ability of streams and lakes to support biological survival, a Biochemical Oxygen Demand Test (BOD) is performed to measure the oxygen-depleted aqueous solution of an organic-containing sample and determine the dissolved oxygen concentration and the temperature of the sample aqueous solution. Relationship between.
The dissolved oxygen concentration is usually in mg/L (dissolved oxygen per liter of water) or ppm (parts per million). The relationship between oxygen concentration and partial pressure varies with the salinity of each sample solution, so most meter manufacturers provide manual adjustment of salinity to correct for changes caused by different ion concentrations. According to the standard dissolved oxygen measurement, the temperature affects the solubility and diffusion rate of oxygen, and therefore temperature compensation must be performed. Some dissolved oxygen meters compare the calculated oxygen content with the observed concentration to find the saturation percentage (O2% sat.)
Dissolved oxygen electrodes are available in two ways, polarographic and galvanic. Polarographic electrodes require the instrument to input a voltage to polarize the electrodes. Since the applied voltage may take up to 15 minutes to stabilize, polarographic electrodes are usually preheated before use to ensure that the electrodes are properly polarized. The two poles of the galvanic type consist of two different metals that spontaneously generate voltage. Since the galvanic voltage is generated spontaneously rather than externally, the galvanic electrode does not require the "preheating" required for polarization of polarographic electrodes.
Example of a water treatment plant: Biochemical Oxygen Demand (BOD) Test The BOD test is generally used in a wastewater treatment plant. It is important that the water treatment plant needs to know the amount of oxygen consumed by the microorganisms when decomposing organic matter from the water. This test allows the water treatment plant to determine the effectiveness of the water treatment or the amount of contamination that still exists. The relative oxygen demand of wastewater, effluent and sewage can be determined by measuring the amount of oxygen dissolved in the sample at the start and end of a particular incubation period. The BOD can be calculated by measuring the dissolved oxygen at time 1 (T1) minus the dissolved oxygen at time 2 (T2); multiplying this value by the final sample volume (VF) and dividing by the initial sample volume (V). BOD (mg/L) = (T1–T2)VF/V.
The dissolved oxygen electrode uses a membrane to separate the platinum cathode, the silver anode, and the electrolyte from the outside. In general, the cathode is in direct contact with this membrane. Oxygen diffuses through the membrane at a ratio proportional to its partial pressure, and the higher the oxygen partial pressure, the more oxygen passes through the membrane. When dissolved oxygen penetrates the membrane continuously and penetrates into the cavity, it is reduced at the cathode to generate a current. This current is displayed on the meter. Since this current is directly proportional to the dissolved oxygen concentration, the calibration instrument simply converts the measured current to concentration units.
SECCO's environmentally-friendly dissolved oxygen electrode can be widely used to measure the dissolved oxygen content in various situations. It can be used to monitor the oxygen content which will affect the reaction speed, process efficiency, or environment, especially the cultivation of water, photosynthesis and respiration. Role and site measurement, environmental testing (lakes, streams, oceans), water/wastewater treatment, wine production, etc. In assessing the ability of streams and lakes to support biological survival, a Biochemical Oxygen Demand Test (BOD) is performed to measure the oxygen-depleted aqueous solution of an organic-containing sample and determine the dissolved oxygen concentration and the temperature of the sample aqueous solution. Relationship between.
The dissolved oxygen concentration is usually in mg/L (dissolved oxygen per liter of water) or ppm (parts per million). The relationship between oxygen concentration and partial pressure varies with the salinity of each sample solution, so most meter manufacturers provide manual adjustment of salinity to correct for changes caused by different ion concentrations. According to the standard dissolved oxygen measurement, the temperature affects the solubility and diffusion rate of oxygen, and therefore temperature compensation must be performed. Some dissolved oxygen meters compare the calculated oxygen content with the observed concentration to find the saturation percentage (O2% sat.)
Dissolved oxygen electrodes are available in two ways, polarographic and galvanic. Polarographic electrodes require the instrument to input a voltage to polarize the electrodes. Since the applied voltage may take up to 15 minutes to stabilize, polarographic electrodes are usually preheated before use to ensure that the electrodes are properly polarized. The two poles of the galvanic type consist of two different metals that spontaneously generate voltage. Since the galvanic voltage is generated spontaneously rather than externally, the galvanic electrode does not require the "preheating" required for polarization of polarographic electrodes.
Example of a water treatment plant: Biochemical Oxygen Demand (BOD) Test The BOD test is generally used in a wastewater treatment plant. It is important that the water treatment plant needs to know the amount of oxygen consumed by the microorganisms when decomposing organic matter from the water. This test allows the water treatment plant to determine the effectiveness of the water treatment or the amount of contamination that still exists. The relative oxygen demand of wastewater, effluent and sewage can be determined by measuring the amount of oxygen dissolved in the sample at the start and end of a particular incubation period. The BOD can be calculated by measuring the dissolved oxygen at time 1 (T1) minus the dissolved oxygen at time 2 (T2); multiplying this value by the final sample volume (VF) and dividing by the initial sample volume (V). BOD (mg/L) = (T1–T2)VF/V.
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