Dear Ulrike

You could also try Sigma Aldrich No. 26609-4 (Kupfer, Drehspäne, 99%)?

regards-
Manfred Jaklitsch
International Atomic Energy Agency
Department of Nuclear Sciences and Applications
Isotope Hydrology Laboratory
P.O. Box 100
A-1400 Vienna, Austria
Phone: +43-1-2600 21768  Fax: +43-1-26007 21768
E-mail: [log in to unmask]


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