Explain in detail the measurement principle and functional characteristics of the COD analyzer

The measuring principle of the COD measuring instrument: add a known amount of potassium dichromate solution to the sample, use silver sulfate as a catalyst in a strong sulfuric acid medium, and measure the COD value by spectrophotometry after high-temperature digestion. When the COD value in the sample is 100mg/L to 1000mg/L, measure the absorbance of trivalent chromium (Cr3+) produced by the reduction of potassium dichromate, and the increase value of the COD value and the absorbance of trivalent chromium (Cr3+) in the sample In direct proportion, the absorbance of trivalent chromium (Cr3+) is converted into the COD value of the sample. When the COD value in the sample is 5mg/L to 150mg/L, measure the total absorbance of the two chromium ions of the unreduced hexavalent chromium (Cr6+) and the reduced trivalent chromium (Cr3+) of potassium dichromate; The COD value in the sample is proportional to the decrease in absorbance of hexavalent chromium (Cr6+), proportional to the increase in absorbance of trivalent chromium (Cr3+), and proportional to the decrease in total absorbance. Convert the total absorbance into the value of the sample COD value. Functional characteristics of the COD analyzer: 1. Accurately measure COD, ammonia nitrogen, total phosphorus, total nitrogen, turbidity, etc. 2. The instrument comes with more than 96 standard curves, which can be modified and saved by itself. 3. The instrument can automatically calculate and store more than 100 4. Can accurately store 4000 measurement results (including measurement time, call curve, value) 5. Print current data and all stored historical data 6. Transfer current data and all stored historical data to the computer 7. Digest The instrument adopts intelligent PID temperature control technology, automatically adjusts and controls the constant temperature, and achieves constant temperature control in the true sense. 8. Automatic constant temperature reminder, automatic countdown reminder, timing time can be adjusted and saved at will. 9. Custom timing system, which can be customized by users Setting operation 10. It can be expanded to an advanced intelligent spectrophotometer, and hundreds of water quality detection parameters can be measured by photometry. 11. Large-screen LCD display, Chinese interface, guided operation, fast, accurate and safe detection
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