Preparation device and detection method of carbonate coupling isotope

Abstract

The invention provides a carbonate coupling isotope preparation device. The preparation device enables continuous injection of multiple samples in a closed environment, and the sample introduction environment and the preparation process can effectively avoid the interference of carbon dioxide gas containing <13>C<18>O<16>O generated by the sample by carbon dioxide in air. The invention further provides a detection method of the carbonate coupling isotope, wherein the preparation of carbon dioxide gas containing <13>C<18>O<16>O using the carbonate coupling isotope preparation device, and the abundance of elements is detected; and the application of the preparation device in carbonate coupling isotope detection is also provided.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to the field of detection of carbonate coupled isotopes used in aspects such as paleoclimate, archeology and mineral resource exploration. Background technique [0002] Carbonate coupled isotope (Clumped isotope) is a new type of paleo-temperature indicator recently developed in the world. Since it is only controlled by the temperature of carbonate formation, it can accurately reconstruct the ambient temperature, and it is useful for restoring the paleo-temperature during the geological warming period. Temperature provides an effective means. Coupled isotopes are isotopic clusters or molecules composed of two or more heavy isotopes (Eilerand Schauble, 2004). Due to the limitation of testing capacity, carbonate coupling isotopes mainly refer to the two most abundant heavy isotopes in carbonates 13 C and 18 Abundance of O bonds. Since the traditional phosphoric acid method is...

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Problems solved by technology

However, a prominent problem at present is that the coupled isotope data of the same sample measured by different laboratories are very different, and the converted temperature varies by tens of degrees.

The reason for the above differences is mainly due to the defects of the off-line preparation method: due to the long time of coupling isotope measurement (usually it takes two and a half hours to measure a sample), the prepared CO 2 The gas needs to be placed in the sample collection tube for a period of time, which may exchange isotopes with the trace water adsorbed on the sample tube wall, thus affecting the Δ 47 The accuracy of the value; at the same time, manual operation will inevitably introduce human error in the offline preparation process

However, the carbonate reaction device still has the following problems: (1) there is a defect in the sealing connection between the reaction vessel and the vacuum pipeline: the connection is realized by extruding the inner wall of the vessel and the O-ring under negative pressure, resulting in During the sample reaction process, the vacuum in the reaction vessel cannot be sustained, and a small air leakage will affect the accuracy of carbonate coupled isotope analysis; (2) the reaction is carried out by dropping acid, and the amount of sample that can be loaded is relatively small (maximum At about 250μg), the CO produced by the reaction 2 The signal strength decays quickly, and it is impossible to obtain a long-term stable integral signal, so the analysis accuracy is poor (Δ 47 Accuracy is ±0.02‰, equivalent to ±4°C)

Therefore, the preparation device cannot meet the requirements of high-precision temperature reconstruction

Perhaps due to the above reasons, this preparation method has not been promoted internationally

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