High precision measurements of 17O/16O and 18O/16O ratios in H2O
High precision measurements of 17O/16O and 18O/16O ratios in H2O
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DOI：
10.1002/rcm.2250
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发表时间：
2005-01-01
影响因子：
2
通讯作者：
Luz, B
中科院分区：
文献类型：
--
作者：
Barkan, E;Luz, B
我们优化了用固体试剂CoF3进行水氟化生产O-2的方法。这使得通过双进气质谱计测量O-17和O-18三角洲的同位素比率具有非常高的精度，达到千分之0.01至0.03%。用该方法测得大气O-2的O-17和O-18增量分别为12.08‰和23.88‰。同样，与VSMOW相比，GISP的增量O-17和增量O-18分别为-13.12和-24.73‰，而SLAP的增量O-17和增量O-18分别为-29.48‰和-55.11‰。在ln(增量O-17+1)与ln(增量O-18+1)图中分析这些数据，得到回归系数(λ)为0.5279+/-0.0001(R-2=0.999999)的直线。我们还测定了汽液平衡中的分馏因子17α和18α，发现17α/ln(1)8α的比值在11.4C到41.5C范围内是恒定的(0.529+/-0.001)。版权所有(C)2005John Wiley&Sons，Ltd.
We have optimized the method of water fluorination using the solid reagent CoF3 to produce O-2. This allows isotope ratio measurements by dual-inlet mass spectrometry with very high precision of 0.01 to 0.03 parts per thousand for both delta O-17 and delta O-18. Using this method, delta O-17 and delta O-18 of atmospheric O-2 were determined as 12.08 and 23.88 parts per thousand vs. VSMOW, respectively. Likewise, delta O-17 and delta O-18 of GISP were -13.12 and -24.73 parts per thousand, and for SLAP they were -29.48 and -55.11 parts per thousand vs. VSMOW, respectively. Analysis of these data in a ln(delta O-17 + 1) vs. ln(delta O-18+ 1) plot yields a line with a regression coefficient (lambda) of 0.5279 +/- 0.0001 (R-2 = 0.999999). We also determined the fractionation factors 17 alpha and 18 alpha in liquid-vapor equilibrium, and found that the ratio In 17 alpha/ln(1) 8 alpha is constant (0.529 +/- 0.001) over the temperature range 11.4 to 41.5 degrees C. Copyright (c) 2005 John Wiley & Sons, Ltd.