⑴ Potassium dichromate cleaning solution: According to different needs, choose any of the following concentrations. Dissolve potassium dichromate in water first, then slowly add concentrated sulfuric acid. Note that high heat can be generated at this time, and the container should be prevented from breaking. Potassium dichromate cleaning solution has strong decontamination power and high corrosiveness. Avoid contact with skin and clothes. In order to prevent deterioration by absorbing air moisture, this liquid should be stored in a container with a lid. If the cleaning effect is poor, add a small amount of potassium dichromate and concentrated sulfuric acid, and continue to use it. Until the liquid turns blue-green, it can no longer be used. When preparing potassium dichromate cleaning solution, it is advisable to use high-temperature resistant ceramic tanks or acid-resistant enamel or plastic containers. When using glassware, special care should be taken to prevent it from breaking due to high heat, and avoid using a measuring cylinder to prepare it.
⑵Trisodium phosphate is made into a 5%-10% aqueous solution, which can be used to wash oil stains on glassware, but corroded glass is often used to make the surface of theware fuzzy and rough.
⑶The nitric acid cleaning solution is made into a 50% aqueous solution, which can be used to clean the microtiter tube. ⑷Ethylenediaminetetraacetic acid disodium (EDTA sodium salt) is made into a 5%-10% aqueous solution, which can wash off the white precipitate adhering to the inner wall of the glassware. ⑸Urea solution Urea is a good solvent for dissolving protein, and it is suitable for washing straws and test tubes with proteins such as blood serum.