Лаборатория иши №5

Safety rules when working with mercury

1. 
   Metallic mercury is widely used in laboratory practice, both open and closed (rheometers, thermometers, etc.). Vapors of mercury and some of its salts are strong cumulative toxins. The concentration of mercury vapor in the air should not exceed 0.01 mg / m3.
   
2. 
   Mercury vapors are well absorbed by plaster, wood, cloth, rust, etc. and then desorbed and evaporated. If mercury in a metallic state spills on the floor, its very small particles can penetrate into cracks in walls, floors, furniture, and then slowly evaporate. When mercury devices (eg monometers, rheometers) are installed in rooms, special containers must be installed under them.
   
3. 
   Involuntary spills of mercury should be immediately collected using a special suction pump or pump. Fine particles are collected using a Zn plate. Then the floor is mixed with a solution of 3% potassium permanganate in 1 liter of 20% solution of iron (IV) chloride with the addition of 5 ml of concentrated sulfuric acid, and the floor of the room is demercurized. The room air is then analyzed for mercury.
   

Safety rules for the use of chemical containers made of glass

1. 
   When covering high-walled glassware with plugs, hold its neck close to the plug.
   
2. 
   It is not possible to close a heated glass jar with a polished stopper without cooling it.
   
3. 
   Liquids should be heated in glass jars and boiled in suction cupboards.
   

Safety rules for the use of gas burners in the laboratory

1. 
   Burnt gas burners and other heaters should not be left unattended.
   
2. 
   When using the burner, do not allow the burner to burn at work. If the flame is absorbed by the burner, the gas or air flow must be adjusted.
   
3. 
   To prevent overheating of the desktop, use protective equipment such as asbestos, marble, brick under the burner and other heating means.