Wonderful experiment: explanation of the standard solution configuration of the inspection institute - Database & Sql Blog Articles

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Wonderful experiment: The standard solution configuration of the inspection center is specially mentioned. On this Monday, several managers of our company discussed the management of standard products with technicians, and also shared the essentials and so on to friends. We. We went on to see the relevant issues today. Before the day of work, the technicians released some standards for the configuration of the solution and places to pay attention to. Shanghai Jinma has a wonderful experimental life with you, and the standard solution configuration of the China Inspection Institute is specially mentioned.
According to the basic properties of its solution:
1. The solution used in the analysis experiment was prepared by using pure water, and the container was washed with pure water three times or more. Specially required solutions should be tested in advance for the blank value of pure water.
2. The purity of the reagents used should be analytically pure or analytically pure, and the corresponding grades of reagents should be reasonably selected according to different work requirements.
3, in order to ensure that the reagent is not contaminated, use a clean horn spoon to remove from the reagent bottle, never grab it by hand.
4. The reagent agglomerate can be crushed and removed by a clean thick glass rod or porcelain shovel.
5. Do not align the bottle mouth with the face when opening the volatile reagent bottle stopper. Due to the high room temperature in summer, it is easy to flush out the gas in the reagent bottle. It is best to soak the bottle in cold water for a while and then open the stopper. Bottles that emit toxic, odorous gases should be sealed with wax.
6. If the smell of the scenting agent is off, keep the bottle mouth away from the nose and fan it on the top of the reagent bottle. Never use the tongue to taste the reagent.
7. The weight of the balance used, the burette, the volumetric flask and the pipette should be corrected regularly.
8. When preparing solutions such as sulfuric acid, phosphoric acid, hydrochloric acid, etc., the acid should be poured into water. For reagents that release more heat during dissolution, do not prepare in the reagent bottle to avoid bursting.
9. When preparing the sulfuric acid solution, the concentrated sulfuric acid should be divided into small portions and slowly poured into the water, while stirring, and if necessary, cool the outer wall of the beaker with cold water. When dissolving sodium hydroxide, potassium hydroxide, etc., a large amount of exotherm is also required to be carried out in a heat-resistant container.
10. When preparing a solution with an organic solvent, sometimes the organic matter dissolves slowly, and should be stirred from time to time. The solution can be warmed in a hot water bath and cannot be directly heated. Keep flammable solvents away from open flames. Almost all organic solvents are toxic and should be handled in a fume hood. To avoid unnecessary evaporation of organic solvents, the beaker should be capped.
11. Do not touch the corrosive solution by hand. The waste liquid should be detoxified and should not be poured directly into the sewer.
12, the solution should be filled with a reagent bottle with a plug, see the light easily decomposed solution should be installed in a brown bottle, volatile reagents such as solutions prepared with organic solvents, the bottle stopper should be strict, see the air is easy to deteriorate and release corrosive gases The solution should also be tightly closed and sealed with wax for long-term storage. The concentrated lye is applied in a plastic bottle. If it is packed in a glass bottle, it should be tightly packed with a rubber stopper.
13. Each bottle of reagent solution must be labeled with the name, specification, concentration, date of preparation, expiration date, and label of the formulator.
Since its establishment eight years ago, Shanghai Jinma has provided sincere service to every customer with its honest and professional business philosophy. At the same time, I am also very grateful to all the teachers for their support to the company for many years! I hope that through our unremitting efforts, we can make greater contributions to the cause of scientific research! You are welcome to call the salesperson to obtain the standard product manual and its basic information.