Dear Benoit,

The US Geological Survey (https://isotopes.usgs.gov/lab/referencematerials.html) have two human hair isotope standards (USGS 42 & 43) that have been characterized for d34S.  Maybe not exactly what you’re looking for, but hopefully this helps.  

Cheers,
Simon


On Dec 14, 2018, at 9:09 AM, Benoit Lebreton <[log in to unmask]> wrote:

Dear all,

We are looking for an organic standard for d34S measurements with a value close to 20 pm ? We only found inorganic standards so far. Does anyone know about such a standard and where to buy it ?

Many thanks in advance,

Benoit

*****
Simon Poulson
Research Professor
Dept. Geological Sciences & Engineering MS-172
University of Nevada-Reno
1664 N. Virginia St.
Reno, NV 89557-0138 USA
(775) 784-1104
Fax: (775) 784-1833
[log in to unmask]
*****