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Written by: Chen Shuxia
2020-08-07 08:00
Last update date: 2020-08-07 08:00The epidemic situation in Hong Kong is out of control, and many companies or restaurants have purchased deep disinfection services for "major cleaning" for peace of mind. However, the fees charged by companies in the market are by no means cheap. If it is an urgent order on the same day, a cleaning company is asking for nearly 10,000 yuan in terms of restaurants within a thousand feet. Major cleaning and disinfection companies also use atomization to attract, but the disinfectants used are different, and some of them do not clearly explain the ingredients used. Some chemical experts said that the safety of atomization disinfection is questionable and that it will cause damage to the lungs, and there are also cheaper alternatives with the same equivalent. Some specialists in the Department of Infection and Infectious Diseases stated that the medical-grade spray disinfection mainly uses hydrogen peroxide, reminding the public to be careful when choosing.
The HKU research shows that household bleach at 1:44 and 1:99 can kill the virus.
(Part 2 of the Anti-epidemic Series in the City)
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Many residential buildings, commercial buildings and restaurants will purchase deep disinfection services in the shops after learning that a confirmed person has visited them. (Profile picture)
K kwong, a PhD from the Department of Chemistry at the University of Hong Kong, said that deep-layer disinfection is generally sprayed on a large scale by means of atomization. This method of sterilization is "definite", but its safety is questionable. "Large-scale use is like suicide." He explained that the human lungs are fragile, and if chemical substances are inhaled or part of the body remains in the body, it will cause permanent damage. Especially the disinfection personnel responsible for the spraying process must wear P100 protective equipment to effectively block them. As for users, It is not a big problem to contact the liquid left over after atomization, "but I definitely won't use it myself."
Many companies in the market claim that they are harmless when using special disinfectants for atomization. He pointed out that only water or alcohol can be considered safe. Because of their volatility, the use of disinfectants has a considerable degree of risk. Various scientific certifications, but suspected of "catching fleas", because there is no evidence to prove that inhalation is harmless, "eating is non-toxic, not equivalent to inhaling poison." Kwong Shishan cited as an example, salt itself is harmless, but after atomization, if inhaled into the lungs Department, severe cases can be fatal.
K Kwong stated that he would not use spray disinfectants or spray disinfection services. (Profile picture)
He also bluntly said that the people who wiped with diluted bleach have enough sterilization effect, and they can even consider "it is convenient to spray water on their own steam engine, and they can achieve the same effect (aerosol disinfection)." K kwong used to kill fleas. "Bomb" is used as a metaphor, referring to the similar principle of atomization and disinfection, meaning that it must be left during use, otherwise the consequences will be dire.
Hong Kong University Research: Diluted bleach can kill viruses
An earlier study by the Hong Kong University School of Medicine found that the new coronavirus can survive for a long time in the environment, up to 7 days on the outer layer of surgical masks, 2 days on glass, banknotes and other surfaces, and only 3 hours on paper towels. The team also found that the environment temperature also affects the virus. The higher the temperature, the faster the virus loses its infectivity. The virus can survive for 14 days at 22 degrees, 2 days at 37 degrees, and only at 70 degrees. Live for 5 minutes.
The study further showed that the detergent effectively kills the virus, using 1:49 and 1:99 household bleach and other products (see figure), all of which did not show the virus after 5 minutes of testing. Related research has been published in the medical journal "Needle Microorganisms".
The Hong Kong University research found that household bleach at 1:49 and 1:99 can effectively kill the new crown pneumonia virus. (Profile picture)
Pan Liewen, director of the Science Division of the Public Health Laboratory of the University of Hong Kong School of Medicine, said in an inquiry from "Hong Kong 01" that the use of 1:49 and 1:99 household bleach in homes, restaurants, etc. is sufficient to kill bacteria. As for the effectiveness of atomization disinfection, the team has not conducted relevant research yet.
Infection and infectious diseases specialist Zeng Qiyin said that atomization disinfection has its effect. Because it can be sprayed to every corner of the environment, "I don’t even feel it if there are people, but atomization can donate tubes to donations." In addition to bleaching In addition to basic cleaning procedures such as water, some hospital isolation wards will also use medical-grade hydrogen peroxide atomization for disinfection, and some private hospitals use non-domestic portable UV lamps that can kill virus genes to illuminate the environmental space. All are international The approved disinfection practices in traditional hospitals are also supported by scientific evidence and literature.
As for other disinfection and antiviral methods in the market, including spray disinfection with disinfectants other than hydrogen peroxide, he has reservations. He also said that it has "great research value", "Don't dare to say it is useful, and don't dare to use it." He reminded users to make their own decisions. He also pointed out that based on the public's right to know, the company has the responsibility to disclose the ingredients used to users, "the right to know what to say". When purchasing services, users should also know the relevant technical principles and whether they are independent Approved by official agencies, including recommendations from WHO and the US Centers for Disease Control and Prevention. He is also concerned about whether antiviral technologies such as photocatalysts are as durable as they claim, and whether they can be mixed with other disinfection products.
Infectious and infectious diseases specialists once reminded that when purchasing disinfection services on the market, one should pay attention to the principles and ingredients, and refer to medical-level practices. (Profile picture)
Doctor: Never wipe things back and forth
Zeng Qiyin said that in general cases of confirmed cases, the correct use of diluted bleach for disinfection is "good enough." He reminded the public to keep the bleach on the object for at least 10 minutes when using it. "Water" should also not be wiped back and forth. The rags used should be divided into different categories, "Don’t wipe the ground cloth, pick up other things."
A spokesperson for the Consumer Council said that it has not received any complaints about the classification of cleaning services.
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