A device for preparing carbon dioxide gas required for carbonate carbon and oxygen isotope analysis

Abstract

The invention discloses a carbon dioxide gas preparation device required in analysis of isotopes of carbon and oxygen in carbonate. The device includes a reaction container which allows a carbonate sample powder and phosphoric acid to be accommodated, a vacuum device used for vacuumizing the reaction container, and a sealing device used for sealing the vacuumized reaction container. The reaction container is in the shape of a vertical tube. A sealing connecting device is arranged on the top of the vertical-tube-shaped reaction container and is matched with the sealing device. A carbonate sample powder accommodating bin and a phosphorus accommodating bin, which are separated from each other, are arranged on the bottom of the vertical-tube-shaped reaction container. When the vertical-tube-shaped reaction container is inclined to a preset angle, phosphorus acid in the phosphorus accommodating bin is poured into the carbonate sample powder accommodating bin and is mixed with the carbonate sample powder in the carbonate sample powder accommodating bin.

Description

technical field [0001] The invention relates to a device for preparing carbon dioxide gas, in particular to a device for preparing carbon dioxide gas required for carbonate carbon and oxygen isotope analysis. Background technique [0002] In the analysis of carbonate carbon and oxygen isotopes, researchers usually use the phosphoric acid method to prepare carbon dioxide gas. [0003] The existing phosphoric acid method uses a glass reaction vessel with vacuum grease for sample preparation. The glass reaction vessel is divided into two parts, that is, a "Y"-shaped branch vessel with a grinding port and a grease-sealed valve with a grinding head (such as figure 1 shown). [0004] Its main preparation process is as follows: First, put the carbonate sample powder into the bottom of the main pipe of the "Y"-shaped branch pipe container, and use a syringe to extract a certain amount of 100% orthophosphoric acid and add it to the side branch pipe; Vacuum grease is applied to the...

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Problems solved by technology

[0006] First, due to the vacuum grease, it can only be used in the reaction preparation process at low temperature (such as 25 ° C), the reaction time is long (about 16 hours), and the preparation efficiency is low;

[0007] Second, it is difficult to add orthophosphoric acid to the side branch. If you are not careful, orthophosphoric acid droplets will fall into the main pipe, resulting in sample loss;

[0008] Third, after each sample preparation, it is necessary to wipe and clean the vacuum grease on each part of the device, which is a cumbersome process and a waste of time

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