Hi Neil,

we switched from Air Products to BOC a while ago, basically because of
lower gas bottle rental charges here in the UK. At the moment we are using
CP grade nitrogen (L-size), which was around £170/bottle from BOC. We
basically followed Isoprime and Thermo installation requirements for the
gas purity. Our nitrogen reference gas is used in an Isoprime100 and a
VisION IRMS as well as in a Thermo Delta V.
But I am also curious to know if some people use a lower purity without


Bastian Hambach
Stable Isotope Ratio Mass Spectrometry Laboratory
Ocean and Earth Science
National Oceanography Centre
University of Southampton
European Way
Southampton, SO14 3ZH
United Kingdom

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2017-01-17 15:41 GMT+00:00 NEIL OGLE <[log in to unmask]>:

> Hi all
> After a few years my N2 ref gas is coming to an end and I want to replace
> it (for Delta V). Previously we used N2 BIP from Air Products but I wish to
> switch to BOC (really just for convenience with all other bottles in the
> lab).  What are people using? N2 CP (99.9992) or is that overkill?  As I
> dont have the AP quality to hand BOCs N4.8 seems too low to me.
> Thanks
> Neil
> Dr. Neil Ogle
> Stable Isotope Facility
> School of Natural and Built Environment
> The Queen’s University of Belfast
> Northern Ireland
> P: UK 2890 974908
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