It is possible that "cooking" your samples could affect the organic
matter, killing off the fresh marine organic matter and leaving
behind resistant stuff like the terrestrial organic matter. Thus, I
guess it could cause the d13C to decrease in the worse case scenario.
Why don't you throw a bit of Saanich Bulk sediment into the oven and
do the same thing. See if you can change the d13C and d15N.
>This may seem like a silly question, but while I was drying down acidified
>sediment samples for d13C analysis, some of the samples appeared to be
>overbaked. The dried sediment in the centre of the bottom of the vial had
>a slightly scorched appearance whereas the sediment on the periphery
>appeared to dry ok.
>How would the d13C signature of these overcooked samples be affected, if
>at all? I know the samples get thrown into a furnace in the end, but I
>would like to know if my sample prep procedure could affect any results.
>University of Victoria
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