BSC Level Lethality Vector Curable Paradigm
BSL-1 None or very low Liquid Yes BS*
BSL-2-like liquid can HIV
BSL-3 High Air Can TBC
BSL-4 Extremely High Air Impossible Ebola
* Bacillus subtilis (Bacillus subtilis)
Microbial test articles or products classified as biosafety level and two do not generate aerosols, so work is carried out on an open laboratory bench; and for some operations that may involve or generate harmful biological substances, they should be in biosafety. It is best to use a Class II biological safety cabinet under these conditions. Biosafety Level 2 test articles or products can be transmitted through liquids, so operators must pay special attention to contaminated sharps. When purchasing safety cabinets, customers also pay attention to ensure that there are no protruding sharp angles, and also need to clean the work surface every day when they are in use.
In biosafety level 3 biological laboratories, all steps related to the manipulation of infectious agents are performed in secondary or tertiary biological safety cabinets by laboratory personnel wearing appropriate protective clothing; for biological safety level 4 All work should be confined to a Class III biological safety cabinet; if performed in a Class II biological safety cabinet, a positive pressure suit equipped with a life support system must be used. It is worth noting that when new unknown microorganisms appear, they must also be carried out in a four-level biosafety protection laboratory. A decision on whether such microorganisms or toxins should be handled in a Tier 4 or a lower laboratory will be made after sufficient data are available.
Biosafety cabinet sterilization principle
The UV sterilizer for biological safety cabinets uses an ultraviolet mercury lamp as the light source, and uses the 253.7nm ultraviolet rays radiated by the mercury vapor in the lamp tube as the main spectral line to sterilize drinking water, kill or remove pathogenic microorganisms on the transmission medium, and make them To achieve harmless treatment. The equipment can effectively kill Escherichia coli, dysentery bacteria, Legionella, Pseudomonas aeruginosa, influenza virus, hepatitis virus, etc., so that the water can be purified.
4. Citation Standards
GB 5749—1985 Sanitary Standard for Drinking Water
GB/T 5750—1985 Standard test method for drinking water
GB/T 6388—1986 Receipt and Delivery Marks for Transport Packaging
GB 8898-1997 Safety requirements for household and similar general-purpose electronic and related equipment powered by grid power
GB 17051—1997 Sanitary Specification for Secondary Water Supply Facilities
GB/T 17219—1998 Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials
YY/T 0160—1994 Straight tube quartz ultraviolet low-pressure mercury disinfection lamp