We analyzed some plastic cups for an isotope class I teach. They included Polyethylene Terephthalate (PETE) Polystyrene (PS) and a third made by Greenware who make their cups from corn. There was no N in any of them - here are the data:

Sample	%C	%N	C/N		δ13C ‰	δ15N ‰
PETE	62.6	0.0			-27.0	no N peak
PS	92.6	0.0			-29.2	no N peak
GW	73.2	0.0			-16.0	no N peak

Cheers
Dave


______________________________________________________________________
David P. Gillikin, Ph.D.
Visiting Assistant Professor of Earth Science and Research Associate
Department of Earth Science and Geography
Vassar College
Box 475
Poughkeepsie, NY  12604

phone:  845-437-5545
main office: 845-437-5540
fax:  845-437-7577
email:  [log in to unmask]
web: http://faculty.vassar.edu/dagillikin/
______________________________________________________________________

----- Original Message -----
From: "jay Brandes" <[log in to unmask]>
To: [log in to unmask]
Sent: Monday, March 29, 2010 4:21:40 PM GMT -05:00 US/Canada Eastern
Subject: [ISOGEOCHEM] plastic isotope values

Does anyone have a good reference for typical C (and maybe H and N) 
isotope values for plastics?

Thanks-Jay Brandes