Peter,

Our lab uses a local wheat flour (C3) and cornstarch (C4) as working
standards (that have been calibrated to Europa flour) for our C & N isotope
ratio and %-composition determinations by continuous-flow EA/IRMS.

Robert D. Stickrod II
Idaho Stable Isotope Science Laboratory
Department of Forest Resources
University of Idaho
Moscow, ID 83844-1133, U.S.A.
[log in to unmask]
(208) 885-6512

________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com