How to clean laboratory glass instruments?

Cleaning and disinfection of glass instruments is a routine operation in the laboratory, and the cleaning agent can be put into the laboratory ultrasonic cleaning machine for cleaning and disinfection operations, saving time and effort.

Laboratory ultrasonic cleaners can clean laboratory glass, ceramic, metal, plastic and rubber and other materials of various shapes and sizes.

1. General steps for washing instruments.

1. Brush with water: use brushes for instruments of various shapes, such as test tube brushes, bottle brushes, burette brushes, etc. First, scrub the instrument with a brush dipped in water, rinse off soluble substances with water and brush off dust from the surface.

2. Scrubbing with synthetic washing water: The commercially available tableware washing spirit is a neutral lotion with nonionic surfactant as the main component, which can be prepared into 1-2% aqueous solution, and can also be used with 5% aqueous solution of washing powder to brush the instrument, they all have strong decontamination ability, and can be warmed or soaked for a short time if necessary.

When the washing instrument is turned upside down, after the water flows out, there should be no small water droplets on the wall of the instrument. At this point, the instrument is flushed three times with a little pure water to wash away the impurities brought by the tap water, and it can be used.

1. Confirm the nature and degree of contamination on glassware and test tubes. Different dirt cleaning methods are also different, and different treatment methods can also be used for the same dirt and different degrees.

2. Dust and water-soluble matter are attached to the glassware. In this case, it should be cleaned with tap water and a brush.

3. Attach deoxidants to glassware. It can be cleaned with a reducing agent.

4. Glassware is attached with oil stains and organic substances. In addition to volumetric instruments, other glassware and test tubes can be cleaned with powder (or detergent) and a brush, or with hot lye if the stain is deep.

5. When carrying out quantitative analysis, the volume instrument can be cleaned with a saturated solution (lotion) of potassium dichromate in concentrated sulfuric acid. It is best to wash the container with water or detergent powder before using the lotion to remove the water from the container before putting in the lotion solution. After washing, wash off the detergent with water and wash three more times with distilled water.

6. The lotion cannot clean the reducing dirt, and the lotion is very corrosive, so you should protect yourself.

7. Turn the glassware upside down, and the water will flow down the wall, and the water will not leave water droplets on the wall, but a thin and uniform water film. At this time, the glassware and test tubes have been cleaned.

Pay attention to safety when cleaning glass instruments, pay attention to handling and wiping gently when cleaning glass instruments, and do not use too much force in the cleaning process to prevent damage.

When cleaning glass instruments, you should first pay attention to safety, do not break the glass together, and kill your hands and feet to be injured and scratch yourself.

1. Any washing method should not damage the glassware, and no corrosive chemicals can be used, nor can the harder items than the glassware be used to wipe the glassware.

2. Generally, new glassware is soaked in 2% hydrochloric acid solution for several hours, and then rinsed with water.

3. Used utensils should be washed immediately, leaving them for too long will increase the difficulty of washing.

4. Strong acids, alkalis and other oxides and volatile toxic substances cannot be poured into the washing tank so as not to pollute the environmental water quality, and must be poured into the waste tank.

5. Appliances containing infectious germs to the human body should be autoclaved before washing.

6. Do not put hard-to-wash utensils with easy-to-wash utensils to avoid increasing the trouble of washing. Do not mix oily utensils with oil-free utensils, otherwise the oil-free utensils will be stained with grease and waste medicine and time.

General glass instruments (such as flasks, beakers, etc.): first rinse with tap water, then brush with soap and washing powder, then wash with tap water, and finally rinse with purified water 3 times (should be rinsed along the wall and fully ** to improve the rinsing effect). Measuring glass instruments (e.g. burettes, pipettes, measuring flasks, measuring cups, etc.):

It can also be washed with soap and laundry detergent, but not with a brush.

Generally, a reagent bottle and triangular bottle: rinse it with tap water first, then put it into the ultrasonic wave filled with clean water, add the melted laundry detergent (or laundry detergent), ultrasonic cleaning for about 5 minutes, and keep the water temperature between 25-45 degrees. Then wash with tap water, and finally rinse with purified water 3 times (should be rinsed along the wall and fully ** to improve the flushing effect, after cleaning, it can be placed on the instrument rack to dry naturally in a dust-free place.

Delicate or difficult-to-wash glass instruments (burettes, pipettes, measuring flasks, colorimetric tubes, glass vertical funnels, etc.): first rinse with tap water, drain, then treat with chromic acid cleaning solution for a period of time (generally left overnight), then clean with tap water, and finally rinse with purified water 3 times.

When scrubbing the instrument, you should first wash your hands with soap, so as not to stick the oil on your hands to the wall of the instrument, which will increase the difficulty of scrubbing.

When the glass instrument is cleaned to the instrument upside down, there are no water droplets on the inner wall.

1. Choose the right detergent.

2. Master the operation method of glass washing instrument. For simple instruments with easily removed substances, such as test tubes. Beakers, etc., use a test tube brush dipped in synthetic detergent to scrub.

In the turn or. When moving the tube brush up and down, it is necessary to apply appropriate force to avoid damaging the instrument and scratching the world**. Then rinse with tap water.

When the instrument is turned upside down, the wall of the instrument forms a uniform water film, and there are no droplets of water or strands, that is, it has been washed. For glass instruments that are difficult to remove the attachments, after using a suitable detergent to dissolve the attachments, remove the washing residue, then scrub them with a test tube to destroy them, and finally rinse them with tap water. Some glass instruments with relatively fine and complex structures cannot be brushed with brushes, such as volumetric flasks, pipettes, etc., and can be soaked with washing liquid.

3. Wash the glass instrument in time. Timely washing of glass instruments facilitates the selection of the right detergent, as it is easy to determine the nature of the residue at that time. In some chemical experiments, the residual liquid after the reaction is poured out in time, and there is no attachment that is difficult to remove on the inner wall of the instrument, but after being left for a period of time, the volatile dissolved residual agent escapes, and there are residues attached to the inner wall of the instrument, making washing difficult.

There are also some substances that can react with the part of the instrument itself, and if not washed in time, the instrument will be damaged or even scrapped.

4. Other precautions. Do not blindly mix various reagents as detergents, nor arbitrarily use various reagents to wash glass instruments. This is not only a waste of medicine, but also prone to danger.

Therefore, the correct cleaning of glass instruments is a serious and important matter.

1. Glassware containing sugar, salt, starch, sediment, alcohol and other substances can be washed with water to achieve the purpose of cleaning. It should be noted that if the attached dirt has dried and hardened, the utensils can be soaked in water for a period of time, and then washed with a brush until they are clean;

2. Glassware stained with oil can be cleaned with laundry detergent, detergent, dish soap, etc. When cleaning, it is necessary to scrub with a brush in still water, and this detergent can also be used to clean glassware with organic oil;

3. Glassware with polymer organic matter should be cleaned with organic solvents, such as gasoline and benzene;

4. In chemical reactions, there are often oxides, acids, alkalis and other dirt attached to the walls of glassware. When cleaning, the land section should be cleaned with strong acid and strong alkali or descaled by neutralizing the chemical reaction according to the special filial piety point of the dirt, and then rinsed with water;

5. It is particularly important to do a good job of mildew and antifouling of optical glass, and it should be cleaned immediately once mildew occurs. To eliminate mildew, clean the mold can be cleaned with a cleaning agent prepared with ethyl hydrodichlorosilane and anhydrous alcohol, and a small amount of ether should be mixed with a small amount of ether in wet and humid weather, or cleaned with propylene oxide and dilute ammonia.