Temperature control system for carbonate coupled isotope test and preparation and testing integrated device

Abstract

The invention provides a temperature control system for a carbonate coupled isotope test. The temperature control system comprises a plurality of temperature control devices, sequentially removes moisture, sulfur-containing substances and hydrocarbon organic substances in a product produced by a sample preparation utensil though temperature conversions of the plurality of temperature control devices, thereby improving a CO2 collection rate obtained in a carbonate coupled isotope preparation reactor, and meanwhile effectively purifying the CO2 in the collection process. Further, the invention provides a carbonate coupled isotope preparation and testing integrated device. The device comprises a carbonate coupled isotope preparation utensil preparing 13C18O16O carbon dioxide gas, and the above-mentioned temperature control system.

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)

[0005] As mentioned above, the manual off-line preparation method is cumbersome and inefficient, and can only analyze 4 to 5 samples per day, which is difficult to meet the needs of researchers for the analysis and testing of a large number of samples

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