CO_2—H_2O平衡法δ^(18)O SMOW值的计算表达式及其关系

Several Expressions and Their Relation for Calculating δ^(18)O SMOW Values in CO_2—H_2O Equilibrium

本文列出了CO_2—H_2O平衡法δ^(18)O计算的几个表达式,举例比较各自的δ^(18)O SMOW值计算结果,指出了过去应用Craig式在换算成δ^(18)O SMOW时存在的问题以及如何换算才符合表达式的原意,并证明了按习惯算法计算的不是其本身的与原始水平衡的CO_2的δ^(18)O SMOW值,而是原始水本身的δ^(18)O SMOW值。

Several expressions for calculation of δ^(18)O are enumerated in CO_2—H_2O equilibrium. Different δ^(18)O SMOW values for the same exampe are compared. For according with original intention of the expressions, there is a problem when the results are translated to δ^(18)O SMOW values. It is proved that the result obtained is not the δ^(18)0 SMOW value of CO_2 in equilibrium with the original water, but is the δ^(18)O SMOW value of the original water when Craig formula is used according to the convention.