I have searched the Isogeochem archives for an answer but did not find one so I will ask again about preservation in alcohol. A lab user has a bunch of amazingly well preserved Pleistocene leaves from Colombia that unfortunately were stored in
alcohol before he got them. He is interested in running bulk carbon isotopes on them.
I have read the Hobson et al., 1997 and Barrow et al., 2008 articles on various methods of preservation of animal tissue. My understanding of the results is that 70% ethanol has little or no affect on the isotopes of animal tissue. But I need
input from the community on if alcohol preserved plant leaf samples are ruined for carbon isotopes.
I realize that alcohol will strip some specific molecules from the plant tissue but my hope is that bulk isotopes might still be good. I am tempted to run them and report the results with the caveat that they were previously stored in alcohol.
Any input would be appreciated.
Isotope Mass Spec Lab manager
of Geological Sciences