The Importance of Classified Storage of Laboratory Chemicals

Reagents are indispensable for any experiment. Reagents not only have various states, but also different reagents have very different performances. Some are very stable at room temperature, some are usually very active, some do not deteriorate at high temperatures, some are flammable and explosive, some have strong aromas, and some are highly toxic. Only by having a deep understanding of the relevant knowledge of chemical reagents can various experiments be carried out safely and smoothly. It can not only ensure that the expected experimental purpose is achieved, but also eliminate pollution to the environment. Therefore, we must first know the classification of reagents. Then master the storage and use of various reagents.

Reagents are also called chemical reagents or test drugs. They are mainly pure chemicals used to achieve chemical reactions, analytical tests, research experiments, teaching experiments, and chemical formulas. They are generally divided into general reagents, high-purity reagents, analytical reagents, instrumental analytical reagents, clinical diagnostic reagents, biochemical reagents, inorganic ion colorimetric reagents, etc.

Most chemical reagents are toxic and dangerous. Strengthening the management of chemical reagents is not only necessary to ensure the quality of analytical results, but also to ensure the safety of people's lives and property. The management of chemical reagents should be properly managed in different ways according to the different characteristics of the reagents, such as toxicity, flammability, corrosiveness and deliquescent properties.

Only a small amount of medicines needed in the short term should be stored in the laboratory. Flammable and explosive reagents should be placed in an iron cabinet with ventilation holes on the top of the cabinet. It is strictly forbidden to store flammable liquids in bottles with a total volume of 20L in the laboratory. Large amounts of reagents should be placed in the reagent warehouse. For general reagents, such as inorganic salts, they should be stored in an orderly manner in the reagent cabinet. They can be stored according to the element periodic system, or according to acids, alkalis, salts, oxides, etc. When storing reagents, pay attention to the storage period of chemical reagents. Some reagents will gradually deteriorate during storage and even form harmful substances. For example, ethers, tetrahydrofuran, dioxane, olefins, liquid paraffin, etc., can form peroxides if exposed to air under light conditions. The longer they are stored, the more dangerous they are. Some reducing reagents, such as benzyltriol, TiCl3, sodium tetrahydroborate, FeS04, vitamin C, vitamin E, and metal iron wire, aluminum, magnesium, zinc powder, etc., are easily oxidized and deteriorated by oxygen in the air. Chemical reagents must be stored separately and cannot be mixed together. Reagents are usually divided into the following categories and stored separately.

The above 6 categories are all dangerous goods.

Management of chemical reagent use：

First, the inspectors are required to strictly implement the inspection standards and chemical reagent preparation and operation procedures, select chemical reagents that meet the inspection requirements to prepare the test solution for inspection, and cannot arbitrarily reduce the required chemical reagent grade. The superior grade should never be used as analytical grade, and the analytical grade should not be used as chemical grade, so as to ensure the quality of the prepared test solution.

Secondly, it is necessary to establish a re-calibration system for the calibration standard solution and a re-calibration system for the standard solution that exceeds the shelf life to ensure the accuracy and reliability of the concentration of the standard solution. The inspectors for re-calibration and re-calibration should have a high level of professional skills and inspection work inspection so as to solve the relevant technical problems encountered during calibration at any time.

Thirdly, it is necessary to strengthen the management of chemical reagent preparation and calibration records, and require the inspectors to record as much information as possible on the preparation and calibration process and calculation, so as to trace and find the cause when problems occur. The chemical reagent preparation and calibration records must be reviewed by a dedicated person before the test solution concentration can be confirmed and the test solution label can be affixed.

The essence of chemical reagent management in use is the management of inspection work quality assurance. Through the management of chemical reagents in use, the properties of the chemical reagents used and prepared are guaranteed to be stable and the concentration is accurate, thereby ensuring the correctness of the inspection results. Of course, the safety management of chemical reagents must also be carried out throughout the entire process of use management. Management of chemical reagent preparation and calibration. The correctness of chemical reagent preparation and calibration is directly related to the accuracy of the inspection results. Therefore, paying attention to this aspect of management is of great significance to ensuring the quality of inspection work.