The school chemical safety cabinet is a key equipment for storing flammable, corrosive, and highly toxic chemicals (such as alcohol, concentrated sulfuric acid, and mercury salts) in high school and university laboratories. Its daily maintenance is directly related to the experimental safety of teachers and students and the stability of the campus environment. Regular inspections, cleaning, and safety drills form the core of the maintenance system, and all three are indispensable.
Regular inspection: the front line of defense for hidden danger investigation
School chemical safety cabinetA graded inspection system of "daily inspection+weekly inspection+monthly inspection" needs to be established.
The daily inspection is the responsibility of the laboratory teacher, focusing on checking the closed status of the cabinet door (whether it automatically rebounds and closes), the function of the lock (whether the key/password can be opened normally), and whether there is obvious corrosion on the outside (such as rusting of steel plates, cracks in PP material) or label detachment.
The weekly inspection is carried out by the laboratory administrator, including whether the internal partitions are stable (without deformation or breakage), whether the ventilation openings are unobstructed (without dust blockage), and whether the leak proof trays are damaged (if there is any liquid residue, it needs to be cleaned immediately).
Monthly inspection requires collaboration with the school safety manager to use professional tools to test: the grounding resistance of the cabinet (should be<4 Ω to prevent static electricity accumulation), the pressure relief valve function of the explosion-proof cabinet (manual pressing test response speed), and the accuracy of the chemical classification label (whether it complies with GB 15258 "Regulations for Writing Chemical Safety Labels").
Any issues discovered during the inspection, such as cabinet door spring failure or ventilation filter saturation, should be immediately recorded and repaired to prevent minor hazards from escalating into major accidents.
Cleaning and maintenance: prevent cross contamination and corrosion
Cleaning is the foundation for maintaining the performance of the safety cabinet. After each experiment, it is necessary to clean the residual chemical packaging in the cabinet (such as empty reagent bottles, droppers), use neutral cleaning agents (to avoid acidic/alkaline cleaning agents corroding the cabinet) and soft cloths to wipe the inner walls, and focus on cleaning corners and gaps in partitions (which are prone to dust or chemical powder accumulation). For PP material safety cabinets storing strong acids/alkalis, organic solvents (such as alcohol and acetone) are prohibited to prevent the dissolution of plastic molecular structures.
Chemicals stored for a long time (such as metallic sodium stored in kerosene) need to be regularly checked for sealing (whether kerosene evaporates, whether sodium blocks oxidize), and the storage time should be recorded (stability needs to be re evaluated if it exceeds 1 year). After cleaning, it is necessary to ensure that the cabinet is dry (especially when storing water reactive chemicals such as potassium and calcium) to avoid residual moisture causing side reactions.
Safety drill: a practical step to enhance emergency response capabilities
The school needs to organize an "emergency drill for chemical safety cabinets" every semester, simulating the following scenarios:
Leakage accident: A student accidentally spilled a reagent bottle while taking concentrated hydrochloric acid. The leaked liquid was collected on a tray in the safety cabinet. Teachers and students should wear splash masks and rubber gloves correctly, neutralize it with sodium bicarbonate solution, and transfer it to the waste liquid tank.
Fire risk: The alcohol reagent in the cabinet may cause a small fire due to its proximity to the heating equipment. Teachers need to immediately close the cabinet door (isolate oxygen) and use a carbon dioxide fire extinguisher to extinguish the fire (do not use water to extinguish alcohol fires).
Mistaken opening and touching: Lower grade students misuse keys to open cabinets. Administrators need to monitor and promptly stop them, and re strengthen the "double person double lock" management system.
After the drill, it is necessary to summarize the problems (such as students' unclear emergency phone numbers and teachers' lack of proficiency in operating procedures), revise the emergency plan, and ensure that teachers and students are familiar with the entire process of "alarm isolation processing reporting".
By conducting regular inspections to identify potential hazards, ensuring cleanliness and maintenance, and conducting safety drills to enhance capabilities,School chemical safety cabinetOnly then can it truly become a "protective shield" that safeguards the safety of teachers and students, providing a reliable foundation for chemical experiment teaching.