Determination of isotope ratios in human tissues enriched with zinc stable isotope tracers using inductively coupled plasma-mass spectrometry (ICP-MS) |
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| Authors: | James K Friel Henry P Longerich Simon E Jackson |
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| Institution: | (1) Department of Biochemistry, Memorial University of Newfoundland, A1B 3X9 St. John's, Newfoundland, Canada;(2) Department of Earth Sciences, Memorial University of Newfoundland, A1B 3X9 St. John's, Newfoundland, Canada;(3) Center for Earth Resources Research, Memorial University of Newfoundland, A1B 3X9 St. John's, Newfoundland, Canada |
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| Abstract: | Enriched fecal and urine samples were prepared using ion-exchange column chromatography for analysis by Inductively Coupled
and Fast Atom Bombardment Mass spectrometry (ICP-MS, FAB-MS) to compare precision between methods. Unenriched samples of human
milk, feces, and whole blood were prepared similarly to monitor instrumental precision and analytical error. A least squares
fit of the ICP-MS results vs the FAB-MS for70Zn/64Zn gave a slope of 0.98, with a relative standard deviation (RSD) of only 0.7%. The results for68Zn/64Zn gave a slope of 0.82, with a RSD of 14%. For unenriched tissues, all potential interferences were removed by the preparation
procedure with no significant differences between preparation for isotope ratios of70Zn/64Zn,68Zn/64Zn,67Zn/64Zn, and66Zn/64Zn. Poisson counting statistics are a major contribution to the total analytical error indicating the usefulness of this procedure
for enrichment studies. |
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| Keywords: | Zinc stable isotopes ICP-MS human studies |
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