Nitrogen Safety Warning
Due to cost reasons, the liquid nitrogen is produced at some
universities by small liquifier machines. The quality with respect
to oxygen content of this nitrogen varies, of course, dependent
on liquifier performance and operator skill between 0.1 and 5 %.
Whereas this is probably not important for everyday laboratory
use, the consumption of this type of nitrogen in long hold
dewars, e.g. NMR magnets, may pose a problem.
Mass spectrometric analysis of the content in seven magnets at
our place, which were uninterrupted filled by this type of
nitrogen since years, indicated last week a nitrogen/oxygen ratio
approaching 1:1 (!). We are currently debating on the most
efficient and safe way to remove the problem.
stb
-------------------------------------------------
Prof. Dr. Stefan Berger
Institut fuer Analytische Chemie
Universitaet Leipzig
Linnéstr.3
04103 Leipzig
Tel: +49 341 9736101
Fax: +49 341 9711833 or 9736115
e-mail: stberger@rz.uni-leipzig.de
home page: http://www.uni-leipzig.de/~nmr/STB/
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