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High Precision Measurements of 17O/16O and 18O/16O Ratios in H2O

High Precision Measurements of 17O/16O and 18O/16O Ratios in H2O

Eugeni Barkan, Boaz Luz

Rapid Commun Mass Spectrom. 2005;19(24):3737-42.

PMID: 16308852

Abstract:

We have optimized the method of water fluorination using the solid reagent CoF3 to produce O2. This allows isotope ratio measurements by dual-inlet mass spectrometry with very high precision of 0.01 to 0.03/1000 for both delta17O and delta18O. Using this method, delta17O and delta18O of atmospheric O2 were determined as 12.08 and 23.88/1000 vs. VSMOW, respectively. Likewise, delta17O and delta18O of GISP were -13.12 and -24.73/1000, and for SLAP they were -29.48 and -55.11/1000 vs. VSMOW, respectively. Analysis of these data in a ln(delta17O + 1) vs. ln(delta18O + 1) plot yields a line with a regression coefficient (lambda) of 0.5279 +/- 0.0001 (R2 = 0.999999). We also determined the fractionation factors 17alpha and 18alpha in liquid-vapor equilibrium, and found that the ratio ln 17alpha/ln 18alpha is constant (0.529 +/- 0.001) over the temperature range 11.4 to 41.5 degrees C.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS7932283	SLAP N-Bn-3Me-Pip Reagent			Price

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