Factors affecting the cleanliness of glassware
[China Glass Net] Clean experimental vessels are a prerequisite for the correct results of the experiment. Therefore, the cleaning of the experimental vessels is an important preparation before the experiment. So, what are the main factors affecting the cleanliness of laboratory glassware?
Factors affecting the cleanliness of glassware:
1, cleaning time:
Time and mechanical force: Generally, the longer the cleaning time, the better the cleaning effect, thus ensuring the cleaning effect.
Time and chemical reaction: Like mechanical force, the cleaning agent also needs a certain time to chemically react with the residue to achieve dissolution, emulsification, and decomposition of the residue.
2, cleaning temperature:
Temperature and surface tension of the wash water: Generally, the higher the temperature, the lower the surface tension and the enhanced wetting ability on the surface of the glassware.
Temperature and cleaning materials and chemical reactions: Each cleaning procedure has a suitable temperature, depending on the chemical reaction of the cleaning material and the cleaning agent. During this reaction, the proper temperature plays a good catalytic role.
Temperature and strong alkali cleaning agent: Containing KOH or NaOH, the higher the cleaning temperature, the better the cleaning effect, but the manual cleaning can not achieve the cleaning at a higher temperature.
Temperature and protein: The high temperature used at the beginning of the cleaning will solidify the protein, which is the main reason why the pre-cleaning process is carried out at room temperature.
3, cleaning mechanical force
The cleaning agent is driven by the circulating pump, and the cleaning liquid is sprayed to directly wipe the surface of the cleaning object by 360 degrees, thereby peeling off the pollutants on the cleaning object. For different cleaning articles, different flow rates and pressures are required to ensure vigorous and vigorous operation. At the same time as cleaning, be sure not to damage the cleaning material because of excessive pressure.
4, cleaning agent
Alkaline detergents use metal saponification and emulsification, soaking and wetting mechanisms to remove metal surface oils such as saponifiable oils (animal and vegetable oils) and non-saponified oils (mineral oils), which are converted into fatty acids and ethanol. Alkaline detergents also react with peptide bonds and carboxylates in proteins to convert them into amino acids and carboxylates, primarily for the washing of organic contaminants.
The acidic detergent mainly prevents and removes mineral deposits, and first converts the salts which are hardly soluble in water in the inorganic state into a soluble state, so that they are easily washed away. For example, lime precipitates produce carbon dioxide under the action of acid, and the dissolved state changes from insoluble to soluble, and the acid can also act as a neutralizing agent to effectively neutralize and remove the alkaline residue on the surface of the vessel to achieve a better washing effect.
5, cleaning water
Water is an important part of the washing process and is used as a dissolving detergent or rinsing liquid. It also provides mechanical and thermal energy during the washing process.
Children'S Legging,Newborn Leggings,Childrens Black Leggings,Childrens Purple Leggings
NINGBO DHK IMPORT & EXPORT CO., LTD , https://www.deheke.com