Dear Colleagues,

I've recently encountered some analytical problems when running siderites.

Does anyone have a calibrated siderite that they run as an internal
standard to check analytical performance when measuring the isotopic
composition of siderite-bearing samples? Is so, could you spare a small
amount (~100mg) so that I can check the accuracy of our analytical
procedures?

Regards,

Steve Crowley

Department of Earth & Ocean Sciences
Herdman Building
University of Liverpool
4 Brownlow Street
Liverpool
L69 3GP
UK