Cleaning NMR Tubes:
NMR tubes are fairly easy to clean if they are emptied immediately after use and washed with acetone (or another suitable solvent depending on the compound used).
An nmr tube washing apparatus is available near the maroon hood in the AIL lab (ed. note: insert instructions here!)
If the tubes are stained then it must be decided whether it is worth to clean them or toss them. (They are quite expensive, so consult your instructor before making this decision!)
If you want to deep-clean them,
- remove all organic solvents. Move up in polarity until your final wash is with water.
- fill the tubes with conc. nitric acid or aqua regia (for really bad cases).
- Let sit overnight or longer
- Rinse thoroughly with water
- Final rinse with acetone.
Ideally, the tubes are dried in an oven (not too hot since the tubes can bend if they sit in there too long) because then you see any residues nicely.