Hello,
I am dealing with some carbon and nitrogen isotopes from kerogen matter
separated from Jurassic black shales. I am using the procedures of organic
geochemical analysis from Wedeking, Hayes & Matzigkeit ()  and i would like
to know if an isotopic fractionation could happen evaporating the sample
instead of dry freezing it.
I would be grateful if anybody could give me some tips.
Thank you
Antonio

PS: Ciao Zac!