In free fatty acids there are two endogenous oxygen atoms whose 18O signature one could theoretically exploit.
However, in FAMES there is only one endogenous oxygen atom left (the carbonyl C=O) while the oxygen in the ester bond comes from methanol (which is also subject to isotopic fractionation). The d18O value of each FAME is therefore a combination of fatty acid oxygen and methanol oxygen which isotope mass balance may or may not disentangle well enough for the calculated carbonyl d18O still to be of diagnostic value.
Prof. Dr W Meier-Augenstein, CChem, FRSC
Stable Isotope Forensics & Analytical Sciences
School of Pharmacy & Life Sciences
The Sir Ian Wood Building
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Stable Isotope Forensics book, 2nd edition:
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Katerina Jandova
Sent: 23 March 2018 11:16
To: [log in to unmask]
Subject: [ISOGEOCHEM] meaning of d18O in 13C compound specific analyses
Measuring 13C-FAMEs with GC IsoLink-IRMS, I am thinking whether there is a way how to use the d18O value for diagnostic purposes. Does it say valuable information regarding the status of combustion reactor? Would anyone share their experience or point me to any literature?
Thanks in advance for any advice.
Katerina Jandova, Ph.D.
Institute for Environmental Studies
Faculty of Science, Charles University
Benatska 2, 128 01 Prague 2
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