Which disinfectants become more effective at killing germs after being heated?
Which disinfectants can have their germ-killing power increased by heating? Please give an introduction. Below are several disinfectant drugs and heating-based disinfection methods: Sodium carbonate. Sodium carbonate: at low temperatures it has a bacteriostatic effect, but only a mild one, whereas the alkaline solution after heating has a strong germ-killing effect. When boiling instruments for disinfection, adding 1%...
Which disinfectants can have their germ-killing power increased by heating? Please give an introduction.
Below are several disinfectant drugs and heating-based disinfection methods:
Sodium carbonate. Sodium carbonate: at low temperatures it has a bacteriostatic effect, but only a mild one, whereas the alkaline solution after heating has a strong germ-killing effect. When boiling instruments for disinfection, adding 1% sodium carbonate can disinfect and dissolve contaminants on the surface, and also makes it easier to scrub off scale. Therefore, for washing or soaking contaminated clothing, utensils, sites, vehicles and for environmental disinfection, a hot 4% sodium carbonate solution is mostly used.
Plant ash: it is a relatively suitable alkaline disinfectant. In 10 kg of water, add 1.5-2 kg of plant ash, heat and boil for 1 hour; after the ash residue settles, the supernatant can be used to disinfect livestock and poultry sheds, with good results. When plant ash water is heated to 70°C, it can be used for spray disinfection against viruses such as foot-and-mouth disease and vesicular diseases.
Sodium hydroxide: commonly known as caustic soda or lye. The higher the temperature of the lye solution, the higher its germ-killing power; if a little salt is added to hot lye water, the germ-killing power is even stronger, and in winter it also has an antifreeze effect. Generally a 2% lye solution is used, commonly for disinfection of the environment, utensils and contaminated sites during viral infections such as foot-and-mouth disease, fowl plague and swine fever, as well as bacterial infections.
Formalin: it has a powerful killing effect on bacteria, spores and viruses. For liquid disinfection, a hot 1%-5% solution is mostly used for disinfecting the environment, utensils and instruments. For bacterial infectious diseases the dosage is 12.5-25 ml per cubic meter; for spore-forming bacteria the dosage is 250 ml per cubic meter; for viral and fungal infectious diseases the dosage is 25 ml per cubic meter. When using formalin for fumigation disinfection, 15-20 ml of formalin per square meter of space plus an equal amount of water can be heated for fumigation disinfection. Alternatively, 30 ml of formalin per square meter plus 15 g of potassium permanganate as an oxidant can be used to generate high temperature, causing the formalin to evaporate, achieving a very good disinfection effect. It should be noted that when using formalin for fumigation disinfection, first close doors and windows, and after 7 hours open them for ventilation. If the irritation of formaldehyde is to be reduced, 2-5 ml of concentrated ammonia water per cubic meter can be heated and evaporated to neutralize the formaldehyde and eliminate the irritation; at the same time, a hot water solution should be used, and the shed temperature should be kept above 24°C with a relative humidity of 75%.
Solid formaldehyde powder: place the solid formaldehyde powder directly on a heat source and heat it to form a gaseous state, producing formaldehyde vapor; this is called fumigation disinfection. When heating, the temperature does not need to be controlled, but the shed should remain hot and humid, with the shed temperature above 24°C and the relative humidity at 75%.
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