Novel sample preparation system for carbon and oxygen isotopes of carbonate and sample preparation method thereof

Abstract

The invention provides a novel sample preparation system for carbon and oxygen isotopes of carbonate and a sample preparation method thereof. The sample preparation system comprises an original sample reaction device, a finished sample extraction device and a system vacuum degree controlling device, wherein the original sample reaction device is connected with an autoinjection device. The sample preparation system employs the autoinjection device, so the automation degree of the sample preparation system is increased, and it is guaranteed that all the saturated phosphoric acid solution enters the bottom of a reaction tube and participates in a reaction; a touch button type vacuum valve is used to replace a conventional turn button type vacuum valve, so service life is prolonged, simplicity of usage of devices is improved, and operation time is shortened in preparation; and a constant temperature water-bath is added, vacuum-pumping and reaction can be completed in the devices in the same time, so a transfer step between vacuum-pumping and sample reaction is reduced. Moreover, the invention provides the sample preparation method of the novel sample preparation system. According to the invention, accuracy and the automation degree in preparation of a test sample are effectively improved, and standardized operational process is formed.

Description

technical field [0001] The invention relates to the technical field of carbonate carbon and oxygen isotope preparation, in particular to a novel carbonate carbon and oxygen isotope sample preparation system and a sample preparation method thereof. Background technique [0002] Carbonate deposits are mainly developed in marine environments, with a small amount found in non-marine environments. Carbonate is an important source rock and reservoir rock. In the current large oil and gas fields at home and abroad, carbonate rock reservoirs account for a large proportion. It is of great theoretical and practical significance to study the carbon and oxygen isotopes of carbonates and guide the exploration and development of oil, gas, groundwater, and various metal and non-metal minerals or industrial raw materials. [0003] At present, carbonate carbon and oxygen isotopes have been widely studied in the reconstruction of paleoenvironment, the study of paleogeothermal and the paleote...

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Problems solved by technology

However, there are few systematic studies on the preparation methods of samples. Due to the different preparation methods of rock samples, the measurement results of inorganic carbon and oxygen isotopes have positive and negative deviations, which can not accurately reflect the information recorded in the samples.

[0004] At present, the sampling method of the preparation device of carbonate carbon and oxygen isotopes is relatively low in automation. Using a manual sampling device may easily cause the liquid to fail to fully react with the solid substance; using a manual rotary vacuum valve is time-consuming and labor-intensive and is likely to cause damage to the knob. The vacuum degree is not up to standard; in addition, the vacuuming operation of the sample and the reaction of the sample need to be operated in two steps. Between the two steps, the sample needs to be transferred. The process is cumbersome, which affects the accuracy of the sample test, and it is difficult to form a standardized operation. process

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