Desiccator = Principle, Working and Standard Operating Procedure | How to Use Desiccator Properly 

Desiccator - Principle, Working and Standard Operating Procedure (ENGLISH) By Solution Pharmacy
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In pharmacy or any other science experiments, we need to preserve the drug or active constituents from herbal sources we have to keep these in a closed and tight container or vessels. Desiccators is one of those instrument or apparatus which are sealable enclosures containing desiccants used for preserving moisture-sensitive items such as cobalt chloride paper for another use. A common use for desiccators is to protect chemicals which are hygroscopic or which react with water from humidity.
The contents of desiccators are exposed to atmospheric moisture whenever the desiccators are opened. It also requires some time to achieve a low humidity. Hence they are not appropriate for storing chemicals which react quickly or violently with atmospheric moisture such as the alkali metals; a glovebox or Schlenk-type apparatus may be more suitable for these purposes.
Desiccators are sometimes used to remove traces of water from an almost-dry sample. Where a desiccator alone is unsatisfactory, the sample may be dried at elevated temperature using Abderhalden's drying pistol.
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