Peter, We could help with the round robin. We have calibrated in
house methane. As well as a methane, ethane, propane, butane
standard.
Bob
On 23 Nov 00, at 8:52, Peter Vervloedt wrote:
Date sent: Thu, 23 Nov 2000 08:52:36 +0100
Send reply to: Stable Isotope Geochemistry <[log in to unmask]>
From: Peter Vervloedt <[log in to unmask]>
Subject: Re: CH4 isotopic standard
To: [log in to unmask]
Dear Richard,
I am glad to hear more and more people are interested to do such
a test. I
will gladly analyse your methane, and I will send a couple of vials of
my
methane too. (I am still waiting for the methane I ordered, but it will
arrive soon).
Hopefully more laboratories will join this test, and if they do, I would
be more than happy to coördinate it all a litle bit (otherwise it could
get quite hectic). To make some things easier, I think it would be a
good
idea to give each lab that joins a number. I will keep a list of what
'future standards' have been analysed by which laboratory. Of course I
will keep everybody informed at all times.
Your number is:
CH4TEST03 (Richard van Logtestijn, the Netherlands)
Other people already participating:
CH4TEST01 (Peter Vervloedt, Belgium)
CH4TEST02 (Anders Ohlsson, Sweden)
CH4TEST03 (Bob Becker, California)
As soon as other people join I will give you their numbers (and e-mail
adresses etc.) too. I don't see any reason to do this anonymously.
Best regards,
Peter.
---
Peter Vervloedt
Laboratory of Applied Physical Chemistry
Ghent University
Coupure, 653
9000 Gent
Belgium
tel.: +32 (0)9 264 6048
fax.: +32 (0)9 264 6230
http://fltbwww.rug.ac.be/isofys
"I have not failed. I've just found 10000 ways that won't work"
- Thomas Alva Edison (1847-1931)
---
-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
Behalf Of Richard van Logtestijn
Sent: Wednesday, November 22, 2000 5:34 PM
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] CH4 isotopic standard
Dear Anders, Bob and Peter,
we are working on delta 13 C from CH4 emitted by peatlands and are willing
to join the measurements as well.
We have a Finnigan PreCon/Gasbench combination and measure from 1.7 ppm
up to 50 ppm CH4 in 100 ml flasks with an autosampler. We will try to
measure higher CH4 conc. as well by manually injecting the CH4.
We also have the problem of finding a good standard. Now we have a 50 ppm
CH4 mixture in synthetic air which we use as reference during our
measurements, but we don't know the value of this CH4. This gas is
analysed now with GC combustion CF-IRMS in another lab, this system is
calibrated versus NGS 1 .
For our 50 ppm reference we have good stdev but the absolute value still
wanders too much in time.
I can also try to inject small amounts of 1% or maybe even pure CH4 in the
100 ml flasks and measure it that way.
I can also send my 50 ppm CH4 to you if you like.
Best regards,
Richard van Logtestijn
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Richard van Logtestijn
Vrije Universiteit
Faculty Biology
Department of Systems Ecology
De Boelelaan 1087
1081 HV Amsterdam
the Netherlands
tel +31 20 4447247
fax +31 20 4447123
e-mail : [log in to unmask]
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Robert J. Drimmie [log in to unmask]
Environmental Isotope Laboratory Telephone: 519-888-4567
Department of Earth Sciences Extension: 2580
University of Waterloo Facsimile: 519-746-0183
Waterloo, Ontario, Canada N2L 3G1 http://sciborg.uwaterloo.ca/research_groups/eilab
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