In either case, the lid of the desiccator should be slightly ajar for 30 seconds prior to complete closing. This will prevent a partial vacuum from forming as the heated air cools.
If such a vacuum forms it might become very difficult to remove the lid without upsetting the samples within. A dried sample should remain in the desiccator for at least 5 minutes before being weighed. If the sample is to remain in the desiccator for an extended period of time before weighing, the top of the weighing bottle of the lid of the vial should be put in place after 10 minutes of cooling. How to Make Nutrient Agar at Home. Physical Properties of Urea. How to Dry Desiccant. Steam Distillation vs.
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Serving Science Globally! How Does a Desiccator Work? In: Laboratory Equipment. Follow Us on:. The main purpose of a desiccator is to keep the components dry and not let any moisture seep in. Hence, before you buy a laboratory desiccator ensure that you check it thoroughly and gauge its moisture-prevention capability, as well. The advanced versions include humidity control benefits at any time. Depending on the function of the desiccator, and whether you want to use it temporarily or permanently, you should purchase it accordingly.
The price of a desiccator depends on their type, size, style, automation. If the apparatus is sophisticated, it will be costly. Some experiments or labs need to move the desiccator from one location to another. Therefore, mobility becomes an important factor in the desiccator selection. As mentioned before, standard desiccators will need to be monitored frequently and automated ones require minimal monitoring. Some laboratory desiccator s will take more time to dry the components than others.
Hence, you need to see the speed at which you want the drying to occur because it will help you determine the selection criteria. Go for suppliers that will provide you with desiccators that have minimal risks, defects, or damages. The desiccator is often taken for granted and precautions in its handling get often ignored.
However, bear in mind that accidents can occur if sufficient care is not exercised in handling and use of desiccators. The cover of the desiccator is usually sealed to its body with a thin layer of silicone grease.
This forms an airtight seal and requires precaution in opening the cover and putting it back. When applying a vacuum take care not to exceed the prescribed limit as it can risk an implosion. Gradually open stop- cock on top to release the vacuum inside at time of opening.
Try sliding the lid. If there is difficulty in sliding make use of a thin spatula carefully to create a rift between the lid and the body.
On hearing a hissing sound of vacuum release slide the top cover by holding the bottom firmly with the other hand. A desiccator can be used routinely for storage of moisture sensitive compounds, standards and for applications requiring weighing to constant weight. However, storage of materials that are highly reactive with water such as sodium metal is not recommended as on coming in contact with humid air on opening it can lead to violent reaction.
Part 1 — Microscopy Microbiology deals with the study of microorganisms that cannot be seen distinctly with the unaided eye. Observation of microorganisms is an….
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