What is the shelf life of chemical reagents, and how long is the shelf life of standard solutions

No problem, you can use it, it's absolutely fine, I'm specialized in chemical reagents, generally speaking, it will be fine within 10 years, but there are a few reagents that have a shelf life.

Yes, but the SDS you said is fine, don't worry.

Full name in Chinese: sodium dodecyl sulfonate.

Full name of Token: sodium dodecylsulfate Alias: sodium lauryl sulfate; sodium lauryl bisulfate; dodecyl sodium sulfate

Molecular formula: C12H25O4SNA

Molecular weight:

Appearance: White powder.

Description: Biochemical studies for the isolation of nucleic acids from proteins and the shedding of certain viruses from host cells; Protein electrophoresis reagents can also be used for plasmid extraction.

Characteristics: Purity: 99%; a260(3% water)<；Solubility: soluble in water, transparent solution, neutral solution;

Melting Point: 204-207

Storage Conditions: Sealed and dried.

Its shelf life depends on the storage conditions.

There are many types of chemical reagents commonly used in laboratories, and their shelf life varies depending on the variety. Generally, reagents that are volatile, easy to decompose under light or associated with light have a short shelf life, and reagents with good stability have a long shelf life. If the chemical reagent expires, it cannot be disposed of at will (usually handled by a special institution), otherwise it will seriously pollute the environment.

The shelf life of sparkling water is generally best not to exceed 1 year, it should expire and should not be used.

Generally, it is one to two years, depending on the product.

The standard solution is valid for 3 months, and the following standard solution should be used and prepared.

The commonly used indicator solution is valid for 1 year, and the starch aqueous solution is valid for 1 week.

The name and expiration date of the test solution shall be implemented in accordance with the provisions in the test solution and buffer in the appendix of the current version of the Chinese Pharmacopoeia. If the pharmacopoeia does not clearly stipulate the expiration date, the validity period of the test solution for general testing is 1 year; The expiration date of buffer solutions above pH = 10 is 2 months, and the validity period of buffer solutions below pH = 10 is 3 months.

The shelf life of laboratory reagents follows the following principles.

1. Inorganic compounds, as long as they are properly stored and the packaging is intact, can theoretically be used indefinitely.

However, those that are susceptible to oxidation (such as sulfites, phenol, ferrous salts, iodides, sulfides, etc.) should be stored in a sealed solid or crystalline manner, and should not be stored for a long time; Aqueous solution, sulfurous acid, hydrosulfuric acid solution should be sealed and stored; Potassium, sodium, and white phosphorus should be sealed in the form of liquid seals).

Substances that are prone to deliquescent can only be stored for a short period of time (1 5 years) under the conditions of avoiding light, cool and dry, depending on whether the packaging and storage conditions meet the regulations.

2. Organic small molecular weight compounds are generally more volatile, and the packaging should be well sealed, and can be stored for a long time (3 5 years).

However, it is easy to oxidize, decompose by heat, easy to polymerize, photosensitive, etc., and can only be stored for a short time (1 5 years) under the conditions of avoiding light, cool and dry, depending on whether the packaging and storage conditions meet the regulations.

3. Organic polymers, especially oils, polysaccharides, proteins, enzymes, peptides and other life materials, are very susceptible to the influence of microorganisms, temperature, and light, and lose their activity, or deteriorate and decay.

4. In principle, reference materials, reference materials and high-purity substances should be stored in strict accordance with the preservation regulations to ensure that the packaging is intact and avoid being affected by the chemical environment, and the storage time should not be too long. In general, reference materials must be used within the expiration date.

5. GB T 601-2002 has clear provisions on the validity period of standard solutions: the storage time at room temperature (15 C 25 C) is generally not more than 2 months. After two months, it should be recalibrated or checked before use.

6. Culture medium: prepare and disinfect the medium according to the regulations, cool to room temperature, store in a dark place (store in the refrigerator as much as possible), and the prepared medium should be used up within one month, see the operating procedures for medium preparation.

7. Unless otherwise specified, the validity period of test solution, buffer and indicator (liquid) is half a year. The mobile phase and purified water for the liquid phase are valid for 15 days.

The reagents used for testing and the prepared test solution must be labeled, and the prepared test solution must be prepared and recorded, of which the medium must also be used and the standard titration solution should be used after it is received. The expiration date of the test reagent must be taken within the storage period.

8. Unless otherwise specified, the liquid reagent is valid for one year after opening, and the solid reagent is valid for three years after opening.

It changes as the chemical properties of the chemical change.

The expiration date of a chemical reagent varies greatly depending on the chemical properties of the chemical. In general, the longer the shelf life of a chemically stable substance, the easier the storage conditions. In the process of storage, transportation and sales, chemical reagents will be affected by external factors such as temperature, light irradiation, air and moisture, and are prone to physical and chemical changes such as deliquescent, mycin, discoloration, polymerization, oxidation, volatilization, sublimation and decomposition, making them ineffective and unusable.

Therefore, it is necessary to adopt reasonable packaging, appropriate storage conditions and transportation methods to ensure that chemical reagents do not deteriorate in the process of storage, transportation and sales. For some states that have special requirements for storage and transportation, they should be handled according to special requirements. Some chemical reagents have a certain shelf life, so you must pay attention to them when using them.

Whether it is a drug or a medical device, the instructions have clarified the storage conditions, please store them as required.

If the collected samples cannot be tested in time, please temporarily store them as follows:

Please store the reagents according to the expiration date and storage conditions on the instruction manual, and the prepared scintillation fluid should be used under environmental conditions higher than 10;

The sample of the gas collection card should be put back into the aluminum foil packaging bag and isolated from other cards at room temperature, and stored in a cool, dry and dark environment for up to 7 days;

The liquid flash gas collector should be tightly capped and stored in a dark environment of 2-8°C for up to 7 days;

If the carbon 13 sample is well sealed, it will not affect the measurement results if it is stored at room temperature for 7-10 days. The prepared scintillation fluid can be stored for two years at room temperature and in a dark environment.

Generally speaking, it should be stored at 4 degrees, of course, some special ones are not included, and it should be stored in accordance with the storage requirements of the reagent.