System and method for preparing carbon dioxide gas needed by carbonate coupled isotope analysis

Abstract

The invention discloses a system and a method for preparing carbon dioxide gas needed by carbonate coupled isotope analysis. The system comprises a reaction unit, a purification unit, a collection unit, a vacuumizing unit and a heating device, wherein the reaction unit comprises at least one carbon dioxide gas reaction generation device for generating carbon dioxide gas; the purification unit comprises a cold trap assembly for freezing and collecting the carbon dioxide gas generated by the carbon dioxide gas reaction generation device and removing moisture and organic hydrocarbon impurities from the carbon dioxide gas; the collection unit comprises at least one gas collecting device for collecting carbon dioxide gas purified by the purified unit; the heating device is used for heating connecting pipelines of the reaction unit, the purification unit and the collection unit and is further used for heating the purification unit.

Description

technical field [0001] The invention relates to a carbon dioxide gas preparation system and a preparation method, in particular to a carbon dioxide gas preparation system and a preparation method required for carbonate coupled isotope analysis. Background technique [0002] In recent years, carbonate coupled isotopes ( 13 C- 18 The abundance of O bonds, denoted as Δ47) has become an effective means to accurately reconstruct temperature changes in geological history, and has been widely used. [0003] In the analysis of carbonate Δ47, people usually use the traditional phosphoric acid method to prepare carbon dioxide gas from carbonate and determine its coupled isotope. [0004] The traditional phosphoric acid preparation system is a glass vacuum system with sealed grease for the preparation, purification and collection of carbon dioxide in carbonate samples (eg figure 1 shown). [0005] The main process of sample preparation is as follows: [0006] (1) Carbonate and pho...

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Problems solved by technology

[0010] First, because the reaction container is equipped with vacuum grease, it can only be used for the reaction preparation process at low temperature (such as 25 ° C), and the reaction time is long (generally 16 hours), which may easily cause oxygen isotope exchange between carbon dioxide and trace water in the container , thus affecting the accuracy of the Δ47 value;

[0011] Second, the entire preparation system uses a vacuum grease valve, because some organic hydrocarbons in the grease also have a mass number of m / z=47, which will interfere with the determination of carbonate Δ47;

[0012] Third, after each sample preparation is completed, the vacuum grease on each part of the reaction vessel needs to be wiped and cleaned. At the same time, the grease on each valve of the entire preparation system needs to be replaced regularly. The process is cumbersome and wastes time.

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