Commonly used alkaline washing solutions are

Posted by pipettefilterae on March 26th, 2020

For oxidants contaminated on utensils, acid oxalic acid has a slower effect, hydroxylamine has a fast effect and is easy to clean. This lotion is a strong oxidant, but its oxidation is relatively slow. If using decontamination powder, dip the brush with a small amount of decontamination powder, brush the inside and outside of the instrument all over, and then wash it with water until no visible decontamination powder is visible to the naked eye. Two common preparation methods are as follows:  Take 100mL of industrial concentrated sulfuric acid in a beaker, carefully heat, and then slowly add 5g potassium dichromate powder. After it is cooled, store it in a ground glass bottle.

The more commonly used ones are introduced as follows: ⒈ Strong acid oxidant lotion Strong acid oxidant lotion is formulated with dichromic acid methyl (K2Cr2O7) and concentrated sulfuric acid (H2SO4). The temperature of the solution will reach 80 ° C. A thin and clean glass instrument should be able to hold water drops. ⒉ Make a glass instrument for trace metal analysis, soak in a 1: 1 ~ 1: 9HNO3 solution, and then perform ordinary washing.

Ethanol freezing tube of potassium hydroxide and sodium hydroxide solution containing potassium permanganate: These are two strongly alkaline washing liquids, which are very aggressive to glass instruments. The instrument after rinsing with distilled water should be neutral with an indicator. ⒊Alkaline potassium permanganate lotion uses alkaline potassium permanganate as lotion, which has a slow action and is suitable for washing oily utensils. Therefore, this lotion is most widely used in the laboratory. It is suitable for washing oil scale and resin.

Commonly used alkaline washing solutions are: sodium carbonate solution (Na2CO3, soda ash), sodium bicarbonate (Na2HCO3, baking soda), sodium phosphate (Na3PO4, trisodium phosphate) solution, disodium hydrogen phosphate (Na2HPO4) solution and so on. ⒋Pure acid and soda ash lotion according to the nature of the dirt in the vessel, directly soak or dip the vessel with concentrated sulfuric acid (HCL) or concentrated sulfuric acid (H2SO4), concentrated nitric acid (HNO3) (the temperature should not be too high, otherwise the concentrated acid volatilizes the person) . ⒌