双标准法测定δ^(18)O的计算公式

Calculation Equations for δ18O Values by Using Double Standards Method

用双标准质谱分析法测定(~18)O的δ值,并推导出计算δ值的新公式。式中无ρ和α因子,可以直接计算得以SMOW为标准的水样品δ^(18)O。实验结果证实了该方法和公式的正确性,测定结果的精确度均优于10^(-4)。

A CO2-H2O equilibrium- double standards mass spectrometric method was used to determine δ18O values. Two new equations were derived to perform the calculation. The equations do not involve the p and a factors and allows the δ18O values of water samples relative to SMOW to be calculated directly. The equations are proved to be correct by experimental results. The precision of the calculated results is better than 10-4.