Things to be aware of when using the laboratory pH meter
Blowing agents, be defined as compounds which are thermally unstable and decompose to yield gas at the desired polymer processing temperature, are widely used to expand rubber, plastics to create foam. Most of the chemical blowing agents are organic chemicals, while inorganic chemicals are few.
Ac Blowing Agent is an azodicarbonamide blowing agent for rubber and plastics. It has a relatively high decomposition temperature which can be effectively reduced by the addition of small amounts of activators.
Azodicarbonamide, ADCA, ADA, or azo(bis)formamide, is a chemical compound with the molecular formula C2H4O2N4.[1] It is a yellow to orange-red, odorless, crystalline powder. It is sometimes called a 'yoga mat' chemical because of its widespread use in foamed plastics
It is a foaming agent commonly used in industry, which can be used in the production of yoga mats, rubber soles, etc. to increase the elasticity of products, and also can be used in the food industry to increase the strength and flexibility of dough.
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(2) The glass film of the glass electrode ball is extremely thin and easily damaged. When using it in peacetime, avoid contact with hard objects and gently handle them.
(3) The glass film of the glass electrode should not be stained with oil. If it is accidentally stained with oil, it can be washed with carbon tetrachloride or * first, then with alcohol, and finally with distilled water. The grease film also affects the measurement of sensitive bulbs. To remove the film, rinse the sensitive bulb with a 75% alcohol solution, wipe dry with filter paper, rinse well with water, and immerse in distilled water for several hours.
(4) The presence of air bubbles in the potassium chloride solution of the calomel electrode is not allowed, and there is little crystallization to maintain saturation. If there is too much crystallization and the pores are clogged, it is best to add new saturated potassium chloride solution.
(5) If the pH meter reading is unstable and floats, consider replacing the electrode.
(6) If the measuring medium is a protein precipitate (such as milk, cheese, etc.), the electrode should be immersed in pepsin and hydrochloric ACID solution after the measurement to eliminate the treatment; this solution is ready before use, and after use, the electrode is immersed in this The solution was left for a few hours and then rinsed with water and then immersed in distilled water for several hours.