In the daily wastewater quality testing of enterprises, multi parameter water quality analyzers are essential and commonly used detection instruments. The application of multi parameter water quality analysis instruments can quickly detect the degree of pollution caused by various pollution parameters to the water body, and then treat the wastewater in a targeted manner, which plays a crucial role in environmental protection. When the pH value of the water changes, some molecules in the water undergo ionization and structural changes, which affect the determination of COD absorbance.
Explanation of COD analyzer
Single parameter measuring instruments such as COD rapid measuring instrument, ammonia nitrogen rapid measuring instrument, total phosphorus measuring instrument, etc. are commonly used by enterprises for water quality self inspection. For some enterprises with complex pollution factors, the use of single parameter measuring instruments can no longer meet their application needs. For example, many enterprises purchase single parameter measuring instruments, which are not easy to manage on the one hand, and face great waste of detection costs and resource utilization on the other hand. So, is there an instrument that can detect COD, ammonia nitrogen, total phosphorus, heavy metals, inorganic salts and other pollution parameters in samples together?
The working principle of the COD analyzer is to select different specialized reagents for each parameter, and after sufficient reaction in a dedicated digestion tube or colorimetric tube, use the principle of spectrophotometry to detect the absorbance of each pollutant parameter at the corresponding specific wavelength. After data processing by microcomputer technology, the sample concentration value is directly displayed in units of mg/L, ppm, ppb, degree, NTU, etc. When using a multi parameter water quality analyzer to detect pollution parameters such as chemical oxygen demand (COD), a matching COD specific reagent is selected for chemical reaction. The absorbance of the sample is measured at 420nm or 610nm wavelength, and after being calculated by a microcomputer, the COD concentration value of the sample is directly displayed in mg/L.