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Dear Isogeochem list:

I am searching two or three standart for Py-CSIA of Carbon, Nitrogen  
and Deuterium.

I have seen these standart:

· 9-Ethylcarbazole

· Byphenyl

· Benzoic acid

· Octadecanoic acid methyl ester

What are your opinions?

Do you see well buy these standards?

Thank you!!!

Nicasio T. Jiménez-Morillo.
Ph.D. Student Institute for Natural Resources and Agrobiology  
(IRNAS-CSIC), Sevilla, Spain.
University of Seville, Sevilla, Spain.