The difference between desktop cod tester and bod tester

The measurement principle of the desktop COD tester varies according to different measurement methods. For example, the hydroxyl and ozone method and the ozonation method are based on electrochemistry, the UV meter is based on ultraviolet spectroscopy, and the heavy chromium The principle of potassium acid measurement has multiple action principles such as photometry and redox. In the measurement method of the COD measuring instrument, a special UV meter is required. The UV meter is actually a measuring instrument that directly measures the concentration of organic matter in water based on the principle of ultraviolet absorbance. There is a strong linear correlation between the UV value measured by the UV meter and the COD measurement value. COD value can be calculated after the value. COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand) can comprehensively reflect the amount of all organic matter in water. There are also many such detection instruments, the detection method is simple, and the detection results can be obtained in a relatively short period of time. Therefore, they are called Widely used in water quality detection and analysis, it has become an important indicator of water quality monitoring and an important basis for environmental monitoring of water bodies. The main differences between the desktop COD tester and the bod tester are as follows: 1. COD refers to chemical oxygen demand, which is an indicator of oxygen consumption by all organic matter in water; 2. BOD is biological oxygen demand, an indicator of oxygen consumption by microorganisms in water ; 3. COD includes BOD; 4. There are essential differences in the measurement methods and principles of COD detectors and BOD detectors; 5. Most COD detectors use digestion colorimetry, and BOD detectors use five-day differential pressure; The shortest measuring time of the measuring instrument is generally 20 minutes, and the long measuring time of BOD needs 5 days.
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