Produkt code: # 13376

Test reagents for measuring high-range hydrogen peroxide content

In northern latitudes, active oxygen is a particularly favored alternative to chlorine for disinfection. However, the essence of measurement lies in whether the used medium contains persulfate or peroxide. Water disinfected with a medium containing persulfate is measured using the DPD 4 method. When disinfectants with high-range peroxide are employed, hydrogen peroxide tablets are used in conjunction with Acidifying PT tablets. In both cases, the label "Active Oxygen (O2)" is actually misleading. It is not molecular oxygen that oxidizes (disinfects); rather, it is an oxygen radical that quickly combines with another radical to form molecular oxygen (the air we breathe). This is also the main disadvantage of this method; since the disinfection effect does not last long, and its effectiveness is rather limited. Therefore, it is a strict rule that when using active oxygen for disinfection, chlorine is periodically added. However, with the DPD 4 method, false values may arise (when both chlorine and active oxygen are used simultaneously) because the potassium iodide contained in this tablet catalytically decomposes persulfates, indicating a sum of persulfate and chlorine.

For your information: Reagent tablets ensure that the exact required amount of the reagent is always used. Most common tablet types also adhere to strict international standards, aimed at ensuring that all such tablets (e.g., Hydr.peroxide LR) can also be used in all measurement devices provided by any manufacturer.