How are standards stored? Standard
The appropriate storage environment and conditions for different standards should be selected according to their physical and chemical properties and storage requirements, and placed in the specified location.
Storage environment: The storage room should be equipped with air-conditioning facilities as much as possible to ensure that the room is cool, dry, protected from light, and ventilated. The temperature is around 25 ° C and the relative humidity is 50 to 75%. Special varieties are required to be properly stored in strict accordance with the specified storage conditions.
The standard should be stored in a dryer or other suitable container, and each dryer or container should have a special code different from the standard number to indicate the storage location. The dryers are placed in a special cabinet, arranged neatly in sequence, and managed by a special person.
The storage period of standard products is generally carried out according to the specified storage period of standard products. In principle, the standard products of chemical purifiers are provided for 3 years, and the biological reagents and unstable ones are preferably 6 to 12 months.
The storage of standard products should be checked by the administrator once a day in the morning and afternoon for temperature and humidity and record. If it does not meet the requirements, it should be adjusted and corrected in time. In rainy seasons, custodians should increase the frequency of inspections.
Common storage methods for standard products include:
1. Store at room temperature: Usually used for chemically stable standards, it is recommended to store in a dry and cool place.
2. + 4 degree refrigeration: for substances that are not very stable at room temperature, stored in a laboratory freezer (controlled temperature).
3. -20 degree freezing: used for chemically unstable substances that decompose easily at room temperature.
4. -80 degree preservation: Some biologically active substances need to be stored in a specific -80 degree refrigerator.
Transportation conditions: Compared with the long-term storage conditions, the transportation process is relatively short, so the transportation conditions are relatively less strict than the storage conditions. Standard products with long-term storage conditions of room temperature and + 4 degrees can be transported at room temperature. Standard products stored at -20 degrees can be put into ice packs to reduce the temperature during transportation, while substances stored at -80 degrees need to be added to dry ice during transportation. But the effective time of dry ice can only last about 1 day, so this type of material is not suitable for long-distance transportation.
For standards formulated into solutions
When saving, you also need to pay attention to:
Unless the product label indicates that it should be refrigerated or frozen in a laboratory refrigerator, it is best to store it in a cool and dry place at room temperature. Because substances are indeed not easy to decompose at low temperatures, but low temperatures reduce the solubility of compounds, thus causing compounds that are difficult to dissolve at room temperature to precipitate crystals when left at low temperatures for a long time, and once the crystals are precipitated, it is difficult to redissolve.
For standards that have been opened for use
The solution type product is best used up at one time. If it cannot be used up, please try to transfer it to a container that can avoid the evaporation of the solution and store it according to the product label. However, during the storage process, there is still a high possibility that the value of the ingredients does not match the COA due to the evaporation of the solution.
Standard products should also be checked during the period.
The storage time of standard products is actually stipulated in the laboratory accreditation, which is the so-called standard product verification period.
Divided into two types:
The first is whether the purchased standard product is invalid. Generally speaking, the standard product will have a standard certificate. As long as it is stored according to the conditions on the standard product certificate, it can be determined by time whether it is valid or not.
The second is whether the prepared standard solution is invalid. Strictly speaking, it should be confirmed by period verification, that is, the newly prepared standard solution is used to determine whether the prepared standard solution is within the error range to determine whether it is valid or not. (This error range is set within 5% feasible)
