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Non-linear effects in the determination of paleotemperature U37(k') alkenone ratios by chemical ionization mass spectrometry

AuthorsChaler, Roser ; Villanueva, Joan ; Grimalt, Joan O.
Uk′37 index
Issue Date27-Aug-2003
CitationJournal of Chromatography A 1012(1): 87-93 (2003)
AbstractThe performance of gas chromatography coupled to mass spectrometry in the positive chemical ionization mode using ammonia as reagent gas (GC–PCI-MS) in the analysis of C37 alkenones for paleotemperature estimation has been re-evaluated. In some conditions, the discrepancies observed in the measurement of the Uk′37 index with this technique as compared with GC equipped with flame ionization detection (GC–FID) cannot be explained by differences in sensitivity between the tri- and diunsaturated alkenones. Thus, at low (currently <0.3) or high (currently >0.4) Uk′37 values the GC–PCI-MS determinations may be observed to be lower or higher, respectively, than those measured with GC–FID. As shown by analysis of a series of synthetic C37 alkenone standards these discrepant results can be explained by non linear effects in the GC–PCI-MS response factors. Second-order polynomial functions provide equations that describe better the signal to amount of analyte ratios. Users of GC–PCI-MS should calibrate their instruments with standards of known C37 alkenone composition in order to minimize non-linear effects.
Description7 pages, 5 figures, 1 table.-- PMID: 14509345 [PubMed].-- Printed version Sep 12, 2003.-- Presented at the 2nd Meeting of the Spanish Society of Chromatography and Related Techniques, Barcelona, Spain, Nov 26–29, 2002.
Publisher version (URL)http://dx.doi.org/10.1016/S0021-9673(03)01188-9
Appears in Collections:(IDAEA) Artículos
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