Welcome To Huida

How to store different chemical reagents

The storage of chemical reagents is also an important task for laboratory personnel. It is not advisable to store too many flammable, explosive and toxic chemical reagents in a general laboratory, and should be purchased at any time according to the amount. In order to prevent chemical reagents from failing and deteriorating, or even causing accidents, general chemical reagents should be stored in a well-ventilated, clean and dry room, and attention should be paid to preventing pollution from moisture, dust and other substances. At the same time, the corresponding storage method should be adopted according to the nature of the reagent:
1. Reagents that are easily decomposed by light, such as AgNO3, KMnO4, CHCl3, CCl4, H2O2, etc.
2. Reagents that are easily oxidized in contact with air, such as SnCl2, FeSO4, etc.
3. Volatile reagents, such as ethanol, ether, acetone, ethyl acetate, etc., should be stored in brown bottles and placed in a dark place.
4. Reagents that are easy to corrode glass, such as hydrofluoric acid, fluoride-containing salts, caustic alkali, etc., should be stored in plastic bottles, and the bottles containing alkali should use rubber stoppers instead of ground stoppers.
5. Reagents with strong water absorption, such as anhydrous sodium carbonate, sodium hydroxide, potassium hydroxide, calcium chloride, sodium peroxide, concentrated sulfuric acid, etc., should be tightly sealed.
6. Interacting reagents such as volatile acids and ammonia, oxidizing and reducing agents should be stored separately.
7. Flammable and explosive reagents, such as benzene, ether, acetone and other flammable reagents should be stored in a cool and ventilated place without direct sunlight; explosive reagents such as picric acid, perchloric acid and perchlorate, peroxide Hydrogen and high-pressure gas, etc., should be stored in a low temperature place, and should not be placed together with flammable materials. It should not be violently shaken when moving or activated, and the outlet of high-pressure gas should not face people.
8. Highly toxic reagents, such as cyanide, arsenic, mercuric chloride, barium chloride, etc., should be kept in a safe, and should be kept by two persons.
9. Special reagents should adopt special storage methods. Reagents that need to be stored at low temperature must be stored in a refrigerator; working benchmark reagents that have been dried or burned to constant weight should be stored in a desiccator; sodium metal should be sealed in liquid paraffin; white phosphorus should be immersed in water, etc.