The permanganate index is one of the important indicators for detecting the water quality. It is a commonly used indicator reflecting the pollution of organic and inorganic oxidizable substances in water bodies. Its definition is: under certain conditions, potassium permanganate is used to oxidize some organic matter and inorganic reducing substances in the water sample, and the equivalent oxygen amount is calculated based on the consumption of potassium permanganate.
The CODMn-8000 drinking water permanganate index online analyzer produced by Modi-Tech employs the potassium permanganate colorimetric method. After the sample is filtered, it is sent to the digestion tank. Meanwhile, the water quality analyzer controls the heating device for heating. In the digestion tank, potassium permanganate and concentrated sulfuric acid are added in sequence and digested at 100°C. The digestion time can be selected according to the original water quality. After the digested sample has undergone an appropriate cooling period, optical detection is conducted by measuring the absorbance to calculate the permanganate index concentration of the water to be tested.
Matters Needing Attention During the Water Quality Detection Process
The instrument requires preheating after startup. Forcibly skipping and directly measuring will affect the measurement accuracy;
A colorimetric tube without obvious scratches should be selected for measurement. The colorimetric tube should be used and placed with caution, handled gently and placed carefully to avoid scratches, abrasions or stains on the colorimetric bottle, otherwise the performance of the instrument will be severely affected. The solutions for calibration and measurement should be pipetted, digested and cooled in the same batch;
The digested solution should be calibrated and measured as soon as possible to prevent errors caused by the decomposition of potassium permanganate.
Understanding the Characteristics of This Permanganate Index Online Analyzer
· The water sample pretreatment device adopts a maintenance-free design, ensuring that the maintenance cycle exceeds half a year;
· The chemical digestion time can be adjusted;
· The quantitative sampling device can be adjusted to ensure that the instrument can accurately measure various water samples by adjusting the reagent dosage and sampling volume;
· The reagent is taken by a non-contact injection pump to avoid the corrosion of the reagent pump by the reagent, which can extend the component life and reduce the user’s cost of use;
· After the measurement, the entire measurement system will be automatically cleaned with pure water to ensure accurate measurement next time.
