Please see the section on chlorine in:
Brand, W. A., Coplen, T. B., Vogl, J., Rosner, M., and Prohaska, T., 2014,
Assessment of international reference materials for isotope-ratio analysis,
Pure and Applied Chemistry, v. 86, p. 425-467. DOI: 10.1515/pac-2013-1023

Good luck,


On Fri, Oct 21, 2016 at 8:24 AM, Kevin Leenaerts <[log in to unmask]>

> Dear colleagues,
> I am setting up a method measuring Cl isotopes of PCE/TCE/DCE using GC-MS.
> I am looking for reference standards with known delta37 Cl values and could
> only find one TCE standard from A. Schimmelmann 's list.
> As found in literature, it is preferable to have 2 anchor calibration
> points. In case others measure these as well, I am interested in some
> expertise about calibrating and suppliers for these reference standards.
> Kind regards
> Kevin Leenaerts