Does the COD water quality analyzer require reagents?
Of course, the basic principle is: under the control of a microcomputer, the water sample is mixed with potassium bichromate solution and concentrated sulfuric acid, and silver sulfate is added as the catalyst, and the chloride ion in the mercury sulfate complexing solution is added.
The mixture reacts with the oxidant at a temperature of 165 DEG C for a certain period of time. The Cr6+ in the oxidant is reduced to Cr3+.
At this point, the color of the mixture varies. The amount of Cr3+ is converted to a voltage change by photoelectric colorimetry. By measuring the amount of voltage to be changed, the curve is searched and calculated, and the COD value is obtained.
