Questions and answers related to the use of sodium hypochlorite solution (2)

(4) Q: Why is sodium hypochlorite solution the first choice for sterilization? Answer: Analysis of the advantages of sodium hypochlorite solution disinfection-the sterilization effect of sodium hypochlorite disinfectant depends on the concentration of the sodium hypochlorite solution. The higher the concentration, the stronger the bactericidal effect. When the pH value of the sodium hypochlorite solution decreases, more sodium hypochlorite is released, and the bactericidal effect increases. When the pH value of the solution increases, the amount of sodium hypochlorite released decreases, and the bactericidal effect increases. It is reduced. The bactericidal mechanism of sodium hypochlorite includes the oxidation of sodium hypochlorite, the role of new ecological oxygen, and the oxidation. At present, it is believed that the oxidation of sodium hypochlorite is the main one.

The hypochlorous acid formed by sodium hypochlorite in water can not only interact with the cell wall, but because of its small molecule and no charge, it is easy to invade the cell to oxidize the egg or destroy its phosphate dehydrogenase, causing the disorder of sugar metabolism and causing bacteria death. In addition, the new ecological oxygen formed by the decomposition of hypochlorous acid can oxidize the bacterial protein, and the chlorine contained in the disinfectant can chlorinate the bacterial body, thereby achieving the effect of disinfection and sterilization. The effective chlorine concentration is 50mg/L sodium hypochlorite solution for 3 minutes, the killing rate of Escherichia coli and Staphylococcus aureus is more than 99%; when the effective chlorine concentration is 250mg/L, it has effect on the spores of Bacillus subtilis var. In 30 minutes, the killing rate is over 99%; when the effective chlorine concentration is 500mg/L, it acts for 5 minutes; it can destroy the antigenicity of purified HBsAg.

(5) Question: How to use sodium hypochlorite correctly? Answer: How to use sodium hypochlorite correctly—sodium hypochlorite is a highly efficient oxidant, which easily decomposes oxygen in water. The new ecological oxygen has strong oxidizing ability. It is hydrolyzed in water instantly to form hypochlorous acid and sodium hypochlorite solution. The extremely strong oxidizing ability of hypochlorous acid destroys the enzyme system such as the protein on bacteria and viruses, and is very good for pathogenic microorganisms. The inhibitory effect. It can be seen that sodium hypochlorite can not only be used for disinfection and sterilization, but also for bleaching organic chromophores. Therefore, sodium hypochlorite has a wide range of applications in various industries, mainly in the following ways:

① Soaking method. Put the items to be disinfected into a container containing a chlorine-containing disinfectant solution, and then cover and seal it. For the disinfection of items contaminated by bacterial propagules, soak them in a disinfectant containing 500 mg/L of available chlorine for more than 10 minutes.
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② Wipe method. Use the wipe method to disinfect large items or other items that cannot be disinfected by immersion.
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③ Spraying method. For the surface of general contaminated items, spray evenly with 1000mg/L disinfectant for more than 30 minutes; for disinfection of contaminated surfaces with blood-borne pathogens and Mycobacterium tuberculosis, spray evenly with disinfectant containing 2000mg/L of effective chlorine for 60 minutes the above.
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④ Dry powder disinfection method. For the disinfection of excrement, add chlorine-containing disinfectant dry powder to the excrement to make it contain 10000mg/L of available chlorine. After a little stirring, the effect is 2 to 6 hours to disinfect the hospital sewage. Use the dry powder to press 50mg/L of available chlorine. Add the amount to the sewage, stir evenly, and discharge after 2 hours.
(6) Question: What are the precautions for using sodium hypochlorite solution? Answer: How to use the sodium hypochlorite disinfectant safely — 1. The sodium hypochlorite disinfectant produced by this machine is a disinfectant for external use. It should not be taken orally and placed in a place that is not easily accessible to children;
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2. Please use the prepared disinfectant in time, otherwise the concentration of the disinfectant will decrease due to the influence of light and temperature, and the residence time of the disinfectant in the cup should be reduced to extend the service life of the equipment;
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3. The prepared disinfectant should be used on the spot as much as possible, and the excess should be sealed in glass or plastic bottles to avoid light, placed in a dark and dry place and a well-ventilated clean room, and the storage time should not be too long;
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4. In daily life, if the concentration of disinfectant is greater than or equal to 5000mg/L, it belongs to the category of high concentration. Do not let children touch and play when using it;
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5. Textiles woven from natural fibers other than white are prohibited to use disinfectant for sterilization to prevent fading;
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6. It is strictly forbidden to use it with alcohol, vinegar, toilet cleaner, concentrated hydrochloric acid, concentrated sulfuric acid, etc. at the same time.
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