Although I haven't worked specifically with stored nitrogen samples, I have
used several gas-storage methods which may be of some help.
For years, I've used Wheaton's glass serum vials capped with the gray
teflon-faced septa and sealed with crimped aluminum tear-off caps (you can
pull the middle of the cap off for a sample port without compromising the
seal). They seem to provide a more reliable seal than the rubber stoppers
(which sometimes leak). Also, you may want to check into "Vacutainers"
which seem to hold gases quite well, are durable and inexpensive.
As a BIG caution for you, they are shipped with a couple hundred Torr of
nitrogen in them....you will have to evacuate them. As far as degassing of
the stopper, it was not a problem for CO2, but others in ISOGEOCHEM may
have advice for nitrogen?
Hope this helps,
William P. Patterson
Department of Earth Sciences
208 Heroy Geology Laboratory
Syracuse, NY 13244-1070
Outside of a dog, a book is man's best friend.
Inside a dog, it's too dark too read. -Groucho Marx