The liquid nitrogen tank used for sample storage is called “liquid nitrogen sample storage tank“.

The types of samples stored in it include but are not limited to cells, blood, embryos, biological tissues, etc. The main storage method is the liquid phase, that is, the samples are soaked in liquid nitrogen, and the liquid low temperature of -196°C is used to achieve long-term storage and retain activity. .

It should be noted here: the liquid nitrogen that can store samples, the liquid nitrogen sample storage tank only provides a space for retaining liquid nitrogen.

Therefore, the storage of samples requires liquid nitrogen in the liquid nitrogen tank at all times.

Therefore, many users will think like this: Then I add some liquid nitrogen into it every day, isn’t it more guaranteed, and it’s better for samples!

Is that so? Does the liquid nitrogen sample storage tank need to add liquid nitrogen every day?

Definitely not needed!

This method is not infeasible, but if you open the lid and add liquid nitrogen every day, it will be a kind of “disturbance” for samples, especially temperature-sensitive samples. After all, opening the lid cannot prevent external heat from entering, and there will be a little temperature fluctuation in the container. . In addition, the increase in the frequency of opening the lid of the liquid nitrogen sample storage tank also means that the loss will increase. It is unrealistic and economical to add a little bit every day to consume a little bit.

If you are worried about the preservation of samples in the liquid nitrogen storage tank, you should pay more attention to monitoring the liquid level. When you find that the liquid nitrogen cannot completely cover the samples, you should replenish them immediately, which is more labor-saving and economical.