We analyse 15N in seeds and always grind using Liquid N2 in a pestle and
Morter. Never had any problems except we also go through quite a few Pestle
and Morters!

Jon Fear.....

Senior Laboratory Technician
Department of Agricultural Sciences
Imperial College at Wye
Wye
Ashford
Kent TN25 5AH.

Tel:020 759 42879
Fax: 020 759 42640
e-mail [log in to unmask]