[3dem] how to dispose of used liquid nitrogen?

[Tobias Furstenhaupt]

Dear colleagues,
we own a Cryo lightmicroscope (Stellaris 8 Cryo-CLEM from Leica) that uses a 25 liter dewar for liquid nitrogen. Sometimes the session ends early and eventually we have a half-full dewar and we cannot re-use the liquid nitrogen anywhere else - either everything else is full or at some instruments we do not re-use nitrogen because of possible contaminations.

We think of blowing it out with nitrogen gas at a very well ventilated area. But this would require room alterations.
Therefore my question to you: How do you dispose of 10-20 liters of liquid nitrogen (that cannot be used anywhere else)? Or are we unique in our problem?

cheers
Tobias

----------------------------------- 
Tobias Fürstenhaupt, PhD 
head of Electron Microscopy 
Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG) 
Pfotenhauerstrasse 108 
01307 Dresden, Germany 

mail: furstenh at mpi-cbg.de 
phone: (+49) (0)351 210-2690 
cell: (+49) (0)176 / 44498706 (NEW!)