During the analysis of the Δ₄₇ values of CO₂ derived from carbonates, the acid fractionation factor not only allows Δ₄₇ values produced from carbonates and reacted at different temperatures (usually 25 and 90 °C) to be compared to one another, but also provides an effective tool to better understand the mechanism and rate of isotopic exchange of oxygen with water during the phosphoric acid digestion of carbonate minerals. In this study, experiments have been conducted in which calcite (1 sample) and dolomite (4 samples), with varying Δ₄₇ values, have been digested in phosphoric acid (H₃PO₄) at five different temperatures between 25 and 90 °C using both the common acid bath and sealed vessel methods. From these experiments, we show that calcite has an acid fractionation factor which is independent of the reaction method. In contrast, all four dolomites show significant differences between the two methods with the sealed vessel reactions showing much smaller acid fractionation factors than the common acid bath. The magnitude of the acid fractionation factor in the dolomites is also dependent upon the absolute Δ₄₇ value of the sample, with samples possessing lower Δ₄₇ values producing lower acid fractionation factors than those with higher Δ₄₇ values. The explanation for the difference in the behavior of acid fractionation factors between calcite and dolomite, in regard to the technique used, is believed to be related to the rate of reaction of the two minerals and thus the time in which the CO₂ is in contact with the acid and allowed to exchange with the H₂O in the acid and produced during the reaction.

在分析源自碳酸盐的 CO ₂的 Δ ₄₇值期间，酸分馏因子不仅允许将碳酸盐产生并在不同温度（通常为 25 和 90 °C）下反应的Δ ₄₇值相互比较，而且提供了一种有效的工具，可以更好地了解碳酸盐矿物磷酸消化过程中氧与水的同位素交换机制和速率。在本研究中，进行了实验，其中方解石（1 个样品）和白云石（4 个样品）具有不同的 Δ ₄₇值，已在磷酸（H ₃ PO ₄) 在 25 到 90 °C 之间的五种不同温度下，使用普通酸浴和密封容器方法。从这些实验中，我们表明方解石具有与反应方法无关的酸分馏因子。相比之下，所有四种白云岩都显示出两种方法之间的显着差异，密封容器反应显示的酸分馏因子比普通酸浴小得多。白云岩中酸分馏因子的大小也取决于样品的绝对 Δ ₄₇值，具有较低 Δ ₄₇值的样品比具有较高 Δ ₄₇值的样品产生更低的酸分馏因子值。对方解石和白云石之间酸分馏因子行为差异的解释，就所使用的技术而言，据信与两种矿物的反应速率有关，因此与 CO ₂接触的时间有关并允许与酸中的H ₂ O交换并在反应过程中产生。