Alteration of micromilled carbonate delta O-18 during Kiel Device analysis

作者：Tobin Thomas S^*; Schauer Andrew J; Lewarch Evan

来源：Rapid Communications in Mass Spectrometry, 2011, 25(15): 2149-2152.

DOI：10.1002/rcm.5093

Isotopic analysis of carbonate material has been greatly facilitated by the development of autosampling devices such as the Kiel III Carbonate Device, allowing rapid automated analysis of small sample sizes. This analysis is facilitated by holding samples and acid at temperatures around 70 degrees C prior to reaction. In most situations this has no measurable effect on sample powders on practical timeframes, but, when analyzing exceptionally fine-grained material produced by micromilling, the delta O-18 of both aragonite and calcite is altered by -0.1 parts per thousand/day. Laboratories that use this technique should thoroughly test and correct for this phenomenon and avoid storing pre-weighed materials within the Kiel Device or similar drying oven prior to analysis.

• 出版日期2011-8-15