Hi Nathalie, John and others,

Regarding the S-3 standard, I like to emphasize, that the value -32.3%o was 
established in labs where the SF6 method is used. Note that even -31.9%o is 
still within the limits of uncertainty (2 sigma or 95% confidence level).
Usually the absolute d34S scale is somewhat squeezed (by a factor 1.01 to 
1.03) when analysis is done on SO2 gas and this should be taken into account.

Stan Halas



At 12:19 05-08-16 +0100, you wrote:
>Hi John,
>
>IAEA-S3 has a value of -32.3±0.2 in the IAEA report 2004, but I don't get 
>this value either. I obtain a value of -31.55±0.16 per mil. I think there 
>is still a bit of trouble with that one.
>This is a standard provided by Stan Halas. I would like to know what Stan 
>thinks about it, because I much prefer the range of values that we had 
>before between -32.1 and -30.7 per mil...
>
>Nathalie
>--
><><><><><><><><><><><><><><><><><><><><><><><><><>
>Nathalie V. Grassineau
>External Service Manager
>Stable Isotope Laboratories
>Department of Geology
>Queen's Building
>Royal Holloway University of London
>Egham
>Surrey TW20 0EX
>UK
>
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>Tel +44 (0)1784 44 3810 (office)
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>         http://www.gl.rhbnc.ac.uk/silab
><><><><><><><><><><><><><><><><><><><><><><><><><>

Dr. Stanislaw Halas
Mass Spectrometry Laboratory
Institute of Physics, UMCS
20-031 Lublin, Poland
phone: +48 81 537-62-75
fax: +48 81 533-36-69