Freedom from any trace of substance is a must for sample
container in analytical chemistry. Adequate assurance of cleanness can only be
achieved by proper control of the primary materials used and their subsequent
processing and storage.
Wilmad-LabGlass understands the importance of this
requirement and developed a sophisticated automation procedure through heating, iron
free water filtration, and nitrogen drying in a closed environment to make sure
that our NMR tube is meeting this requirement. Now we are applying the same
production procedure on 803A glass pipette.
Below is the spectrum for a water sample ran on one Bruker
850 MHz spectrometer with 128 scans. The sample was prepared by pulling D2O
from an ampoule and squirting it back into the ampoule 4 times with the 803A glass
pipette prior to transfer to a Wilmad NMR tube. The bottom spectrum is a 64 fold expansion of the vertical full scale spectrum on top.