| Citation: | Sen Li, Andrew Schauer, Alexis Licht, Jie Liang, Kate Huntington, Kangning Peng. Clumped Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction. Journal of Earth Science, 2023, 34(3): 726-734. doi: 10.1007/s12583-022-1630-4
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Acid extraction methods have been used in the last half century to selectively extract the CO2 produced from different carbonate minerals in mixed samples. However, these methods are often time-consuming and labor intensive. Their application to clumped isotope (Δ47) analysis has not been demonstrated. We propose here an acid extraction method with phosphoric acid for bulk stable and clumped isotope analysis that treats mixtures of calcite and dolomite the same regardless of the proportional composition. CO2 evolved from calcite is extracted by allowing a reaction with phosphoric acid to proceed for 10 min at 50 ℃. We then extract CO2 evolved from dolomite by rapid ramping the acid temperature from 50 to 90 ℃ and allowing the reaction to complete. The experimental results show that our method yields accurate calcite and dolomite Δ47 values from mixed samples under different proportional compositions. Our method also displays equal or higher accuracy for calcite δ13C and dolomite δ13C and δ18O values from mixtures when compared to previous studies. Our approach exhibits higher sample throughput than previous methods, is adequate for clumped isotopic analysis and simplifies the reaction progression from over 24 h to less than 2 h, while maintaining relatively high isotopic obtaining accuracy. It yet poorly resolves calcite δ18O values, as found with previous methods.
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