Disinfectant content test application program

- Oct 13, 2020-

Affected by the new type of coronavirus pneumonia, various disinfectants, disinfectants and other disinfection products have become essential supplies in our daily lives. Disinfectants mainly include chlorine disinfectants, peroxide disinfectants, aldehyde disinfectants, alcohol disinfectants, iodine disinfectants, phenol disinfectants, ethylene oxide, biguanide disinfectants, and quaternary ammonium salts Disinfectants, among which chlorine-containing disinfectants and peroxide disinfectants are widely used in response to the epidemic.Available chlorine, hydrogen peroxide and sodium chloride are the main components of these two types of disinfectants. Monitoring the content of the main components is the key to ensuring the quality of disinfection products. We use potentiometric titration to determine the content of available chlorine, hydrogen peroxide and sodium chloride in disinfectants, which is currently a relatively simple, reliable and economical method.

Available chlorine content determination


Principle: In an acidic environment, KI (potassium iodide) and sodium hypochlorite can undergo redox reactions to generate iodine and chloride ions. Use starch solution as indicator and titration with sodium thiosulfate standard solution to measure the available chlorine content.


Recommended configuration: Lemag ZDJ-5B, 4B, 4A series automatic potentiometric titrator


Matching electrodes: Leimag 213-01 platinum electrode, Leimag 217-01 double salt bridge reference electrode (external filling liquid is saturated NaNO3)


Reagents: 0.1mol/L sodium thiosulfate standard titration solution, 10% sulfuric acid, reference potassium dichromate, potassium iodide (AR)

bMgl1AdISpGEb524fecKNw

Determination of hydrogen peroxide content


Principle: Hydrogen peroxide can be used as both a reducing agent and an oxidizing agent. In acidic media, hydrogen peroxide acts as an oxidizing agent, but it acts as a reducing agent when reacting with potassium permanganate.


Recommended configuration: Lemag ZDJ-5B, 4B, 4A series automatic potentiometric titrator


Supporting electrodes: Lei Magneto 213-01 platinum electrode, Lei Magneto 215 tungsten electrode


Reagents: sulfuric acid solution: 8+92, sulfuric acid solution: 1+15, standard sodium oxalate, potassium permanganate standard titration solution [c(1/5 KMnO4)=0.1 mol/L]

fHuXlRHISZuER8nQAvuXbQ

Sodium chloride content determination


Principle: Use silver nitrate standard titration solution to titrate sodium chloride in the sample. According to the consumption of silver nitrate standard titration solution, calculate the content of sodium chloride.


Recommended configuration: Lemag ZDJ-5B, 4B, 4A series automatic potentiometric titrator


Matching electrodes: Lei Magnetic 216-01 silver electrode, Lei Magnetic 217-01 double salt bridge reference electrode (external filling liquid is saturated NaNO3)


Reagents: 0.1mol/L silver nitrate standard titration solution, standard sodium chloride

Zc1C7BWgQ56g4AimYlB4GQ

Sodium chloride content determination curve


● Determination of residual chlorine, chlorine dioxide, total chlorine content (chlorine disinfectant)


Principle: N,N-diethyl-1,4-phenylenediamine sulfate (DPD) colorimetric method

At present, anti-epidemic disinfection mostly uses chlorine-containing disinfectants. With the strong oxidation of chlorine, microorganisms in drinking water and medical sewage are non-selectively killed. With the large-scale use of chlorine, the content of available chlorine such as residual chlorine in water is measured. The content and existence state are extremely important to the disinfection effect, the ecological environment and the safety of drinking water.