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Scientific cleaning of acid and alkali resistant reagent bottles is a key step in safeguarding the purity bottom line of experiments
Date: 2025-10-23Read: 12
In the daily operation of the laboratory, acid and alkali resistant reagent bottles are chemical containers used to store strong acids, strong bases, organic solvents, and standard solutions. Although its material has excellent corrosion resistance, if not cleaned properly, residues can cause cross contamination, reagent deterioration, and even affect the accuracy of experimental results. Therefore, mastering scientific and systematic cleaning methods is a key link in safeguarding the purity bottom line of experiments.
1、 Safe use
Before cleaning, be sure to wear acid and alkali resistant gloves, goggles, and lab coats. According to the properties of the residue inside the bottle, it is classified and treated as strong acid (such as H? SO?)? 、 HNO? ）Strong alkalis (such as NaOH, KOH) and organic solvents (such as acetone, ethanol) should be cleaned separately to avoid mixing and producing violent reactions or toxic gases.
2、 Preliminary flushing
After classifying and collecting the waste liquid according to regulations, immediately rinse the inner wall of the bottle repeatedly with a large amount of tap water to wash away visible residues as much as possible. For viscous or crystalline substances, they can be soaked and softened with corresponding solvents (such as dilute alkali for acid, dilute acid for alkali, and ethanol for organic matter) before rinsing.
3、 Deep cleaning
Inorganic acid-base residue: Soak in a 5% -10% sodium carbonate or sodium bicarbonate solution for several hours, neutralize and dissolve residual ions, and then rinse 3-5 times with deionized water.
Organic residue: Soak overnight in chromic acid solution (with caution, strong oxidizing), alkaline potassium permanganate solution, or specialized laboratory cleaning agent, and then rinse with tap water.
Insoluble precipitation: It can be assisted by an ultrasonic cleaner to remove attachments using cavitation effect, especially suitable for graduated bottles.
4、 Purification
Regardless of the cleaning method, it is necessary to repeatedly rinse with deionized water or distilled water for at least 3 times to ensure that there are no cleaning agents or ion residues. For trace analysis experiments, it is recommended to rinse with ultrapure water and air dry in a clean environment.
5、 Drying and Storage
Invert and dry on a dedicated drying rack to prevent dust from falling in. If necessary, clean air or nitrogen can be used to blow dry. Do not use an oven to dry plastic bottles at high temperatures to prevent deformation. After drying, seal the bottle tightly and store it in a clean cabinet, away from sources of contamination.
6、 Attention to special materials
PTFE bottle: Strong corrosion resistance, can be cleaned with aqua regia, but needs to be rinsed;
Glass bottle: Avoid sudden cooling and heating to prevent explosion;
Plastic bottles: Avoid long-term soaking in strong solvents such as acetone and chloroform to prevent swelling.