Chlorine dioxide is a broad-spectrum, highly effective disinfectant that is used for air disinfection. However, in the disinfection work, the environmental conditions of the disinfected place are different. Whether it is airtight or internal paint is very different, it is not appropriate to completely disinfect with the same disinfection dose. This experiment observes the decay rate of chlorine dioxide concentration in the air of different closed rooms and discusses its variation. The report is as follows.
1 Materials and methods
1.1 object
(1) Choose 3 fully enclosed rooms with a volume of 33m3. Each of them has two plastic-steel closed glass doors connected to the corridor, with no windows, good sealing performance, painted walls and floor leather.
(2) Choose 3 ordinary rooms, which are ordinary wooden doors and windows, white and gray walls, and the volume is 36.6~42m3.
1.2 The chlorine dioxide disinfectant is provided by the regular production unit, and the product has the health permit of the Ministry of Health. Activated before use, the concentration is determined by HG3669-2000 CLO2 content determination method.
1.3 Instrument N962 temperature and humidity anemometer; 400 type electric aerosol sprayer (developed by the Academy of Military Medical Sciences); direct reading CLO2 air monitor (iTX) (American Industrial Scientific Sensor Co., Ltd.).
1.4 Method
1.4.1 Dose grouping The general room and the fully enclosed room are spray disinfected in three spray dose groups.
Group 1 (10 mg/m3): sprayed at a concentration of 1000 mg/L after activation at 10 ml/m3.
Group 2 (5 mg/m3): spray at a concentration of 1000 mg/L at 5 ml/m3.
Group 3 (1 mg/m3): sprayed at a concentration of 200 mg/L at 5 ml/m3.
1.4.2 CLO2 concentration monitoring The CLO2 disinfectant was sprayed in the normal room and the fully enclosed room in groups of 10, 5 and 1 mg/m3. The time was started after spraying, and the concentration of CLO2 in the air was monitored after 30 minutes. Observe the time it takes from initial dose to safe dose and complete attenuation.
1.4.3 Temperature and humidity test For the ordinary room and the fully enclosed room, the temperature and humidity are detected before spraying. The spray is started after spraying in different dose groups. After 30 minutes, the temperature and humidity are detected separately and the average value is taken.
2 results
2.1 The change of CLO2 concentration, the clch maintenance time in the air of the fully enclosed room is longer, and the 10mg/m3 group needs 10h39min and 11h33min from the initial dose to the safe dose (0.3mg/rfl3) and complete attenuation (0 mg/m3).
[Investigation and Analysis]
2.2 Temperature and humidity test results in 2 different rooms. Taking the 10 mg/m3 group as an example, the temperature after spraying decreased by 0.4-0.7 °C on average, and the relative humidity increased by 6.9% to 14.6% on average.
3 Discussion
CLO2 is an efficient, broad-spectrum disinfectant. CLO2 has been used to study the disinfection of tunnel air for many years (1, 2J. The Ministry of Health listed CLO2 as an air disinfectant in the "Guidelines for the Control of Infectious Atypical Pneumonia Hospital Infection (Trial) Notice] and formulated corresponding occupations. Hygienic standard L3), that is, the average allowable contact level is 0.3 mg/m3. Taking the 10mg/m3 group as an example, the ordinary room starts from the spray, and the CLO2 decays to the safe dose (0.3mg/m3). It takes 2h25min. This concentration is the hygienic standard for the allowable contact level. The person can enter the room without affecting the health; It takes 2h40min to start to full attenuation (0 mg/m3), which is safer. The test shows. The sealing condition of the room and the difference in interior decoration materials have a great influence on the decay rate of CLO2. Analysis of the fully enclosed room CLO2, the reason for the slow decay rate is mainly because the room has good sealing performance, paint wall, floor leather floor, CLO2 is not easy to be absorbed, and it is quickly vaporized, so the decay time is long. The ordinary bungalows are all white and gray walls, some of the liquid medicine is adsorbed by the wall, and the sealing performance is general, so the decay time is short. It is recommended to adjust the concentration and amount of disinfectant according to the actual situation during disinfection. In the special environment of the tunnel room, in order to avoid excessive humidity, the CLO2 concentration can be increased to reduce the amount of spray. If the microbial contamination at the disinfection site is serious, the sealing performance is poor, there is sun exposure (easy decomposition), the wall decoration material is easy to absorb water and other factors, the dose can be increased or the number of disinfection can be increased.
