The use of melting point and the use of precautions

- Oct 25, 2017 -

Use

According to the definition of physical chemistry, the melting point of matter refers to the temperature when the substance is changed from solid to liquid. In the field of organic chemistry, the determination of melting point is the basic means to identify the nature of matter, and also one of the important methods of purity determination. Therefore, the melting point apparatus plays an important role in the chemical industry and medicine research. It is the necessary instrument for the production of drugs, spices, dyes and other organic crystal substances.

Precautions for use

Melting point determination is the basic means to identify the nature of matter, and is also one of the important methods of purity determination. Therefore, the melting point apparatus plays an important role in the chemical industry and medicine research. It is the necessary instrument for the production of drugs, spices, dyes and other organic crystal substances. Its attention can improve the service life of the instrument.

1. samples required for drying, drying and grinding in clean body crushed, with free fall percussion samples to fill strong capillary, filling height should be consistent, should meet the specific requirements of Chinese pharmacopoeia.

2. when inserting and removing capillaries, care must be taken to avoid fracture.

3. the linear heating rate is different, the greenhouse results are inconsistent, requiring specified specifications.

4. the sample was best filled with five capillaries at one time. The average value of the three readings in the middle was taken as the measurement result to eliminate the accidental error caused by the capillary and sample filling.

5. before the capillary is inserted into the instrument, the soft cloth is used to remove the contaminated substance so as not to contaminate the oil bath.

6. if you need to replace the oil bath tube, please use the method described in the preparation before use.


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