The drying and storage of glass instruments

First, the glass equipment is dry

 

The instruments that are often used in the experiment should be washed and dried after each experiment. For different experiments of the equipment has different requirements for drying, the general quantitative analysis of beakers, conical bottles and other equipment can be used to wash, and for organic chemistry experiments or organic analysis of a lot of equipment is required to dry, and some Requires no water trace, and some require no water. The instrument should be dried according to different requirements.

 

1, dry not urgent use, the requirements of the general dry, can be washed in pure water after the dust in the inverted digging water, and then naturally dry. Place the instrument with a shelf with an oblique nail and a glass cabinet with a vent hole.

 

2, drying

 

Wash the instrument to control the water, placed in the electric oven drying, oven temperature 105-120 ℃ bake about 1h. Can also be placed in the infrared light oven drying. This method applies to general instruments. Weighing bottles used for weighing should be placed in a dryer and dried and stored. With a solid glass plug and thick-walled equipment drying should pay attention to slowly warming and the temperature can not be too high, so as not to bake, the meter can not be placed in the oven bake.

 

Hard tube can be used alcohol drying, from the bottom of the bake, the test tube down, so as not to drop the water tube to burst tube, bake to no water beads, the test tube mouth to catch the water vapor.

 

3, hot (cold) dry wind

 

For large equipment that is anxious to dry or is not suitable for the oven, it is possible to use a small amount of ethanol, acetone (or finally ether) to pour the solvent Solvent to be recycled), and then use the hair dryer blowing, began to use cold wind blowing 1-2min, when most of the solvent evaporated after blowing hot air to completely dry, and then the cold wind blowing the residual steam, so that it is no longer condensed in the container. This method requires good ventilation, to prevent poisoning, can not access the fire, to prevent the organic solvent explosion.

 

Second, the custody of glass equipment

 

In the storage room glass equipment to be classified in different categories, in order to access. Often used glass instruments placed in the experimental cabinet, to be placed safe, high, large on the inside, the following proposed some of the custody of the instrument.

 

1. The pipette is washed and placed in a dusty box.

 

2. After the burette is used, the solution is washed away, filled with pure water, covered with glass short tube or plastic sleeve, and can also be inverted on the burette.

 

3. After the cuvette is washed, the filter paper is placed in a porcelain plate or plastic tray, and then poured into the cuvette box or a clean vessel.

 

4. Instruments with wear plugs

 

The vials or colorimetric tubes are preferably plugged with rubber bands or small threads before they are washed, so as not to break the plug or mix with each other. To be long-term preservation of the grinding instrument in the plug between the pad a piece of paper, so as not to stick long time. Long time do not use the burette to remove the Vaseline back pad paper, with a good bolt to keep the piston.

 

5. Complete sets of equipment such as Soxhlet extractor, gas analyzer run out immediately to wash, put in a special carton to save.

 

In short, we have to be responsible for the spirit of the work, all the glass used after the equipment used to clean, according to the requirements of custody, to develop good work habits, not in the instrument left grease, acid, corrosive substances Including concentrated lye) or toxic drugs, so as to avoid future trouble.