Dear Tim,
below I foreward you again part of my mail of March-17 reporting
the isotopic analysis of the Isotec water together with two
protium water samples from Ontario (one original and one enriched
after electrolysis of 3 liters) and with a standard water sample.
As you see from the attached exel sheet, the MS instrument
made for each sample 3 measurements (for the standard even 5)
and was obviously in a stable condition, with a typical scatter
below 10%.
The measurements were done with a new MS spectrometer, bought
by PSI (Dr. Mathias Saurer) one year ago, which is in short
described as follows (see also web site:
http://www.thermo.com/com/cda/product/detail/1,1055,17314,00.html ):
"High-Temperature Pyrolysis of water (1420 deg C) to H2 in a glassy
carbon reactor, helium carries the gas via an open-split interface to
the isotope-ratio mass-spectrometer, which is equipped with 2 cups for
simultaneous m/z 2 and 3 analysis, special geometry of ion source for
suppression of He-peak tail."
I hope this clarifies any questions Ros Shelhamer might have.
With best regards
Claude
*****************************
-------- Original Message --------
Subject: Analysis of protium water samples at PSI
Date: Thu, 17 Mar 2005 16:59:56 +0100
From: Claude Petitjean <claude.petitjean@psi.ch>
Organization: psi
To: Peter Kammel <kammel@npl.uiuc.edu>, David Hertzog
<hertzog@uiuc.edu>, Steve Clayton <smclayto@uiuc.edu>, Brendan Kiburg
<kiburg@npl.uiuc.edu>, Fred Gray <fegray@socrates.Berkeley.EDU>,
Berhard Lauss <lauss@socrates.Berkeley.EDU>, Tom Banks
<tbanks@socrates.Berkeley.EDU>, Tim Gorringe <gorringe@pa.uky.edu>,
Francoise Mulhauser <Francoise.Mulhauser@psi.ch>, Alexei Vorobyov
<vorobyov@pnpi.spb.ru>, Semenchuk <semench@pnpi.spb.ru>, Malte
Hildebrandt <malte.hildebrandt@psi.ch>, Johny Egger <johny.egger@psi.ch>
Dear friends,
Yesterday, I received new analysis results of various protium water
samples which were analyzed with the new mass spectrograph at PSI by
Matthias Saurer.
The following 3 samples of protium water were analyzed together with
a standard reference water sample ("Haus2"):
- "Isotec", a sample from the new protium water that was bought in
fall 2004 by Tim Gorringe from ISOTEC (Sigma-Aldrich Family). It
is certified as deuterium depleted to a content of max. 0.5 ppm.
- "Ontario Aug2002", a sample of the original water from which we
produced all protium gas used in 2002-2004. The same sample was
already analyzed on OCT-06-2004 with the same new spectrograph
bought by PSI in January 2004.
- "Ontario 2", a sample from the 2 liters left over from the original
5 liters Ontario water supply, i.e. after electrolysis of 3 liters.
It is expected that this left over water has an enriched content of
deuterium due to the isotope effect.
Here is a summary of the results (for details see attachment):
Haus2: D/H = 144.76 ppm (Calibration standard)
================
Isotec: D/H = 3.05 ppm
==============
Ontario Aug2002: D/H = 1.77 ppm, prev result OCT-6-04: D/H = 1.72 ppm
============== ==============
Ontario 2: D/H = 2.95 ppm
==============
From the scatter of single measurements, I estimate the error to these
results to be around +- 0.1 ppm, see attachment. Of course, nothing
can be stated about systematic errors!
With best regards
Claude
PS: you find this note also in the muCap analysis run8 e-log, #33
***************************
Attachment:
protium_water_analysis_MAR-16-2005.xls
Description: MS-Excel spreadsheet