Sample injection system for collecting gas by drainage method and sample injection method

Abstract

The invention belongs to the technical field of determination of rare gas content in gas samples, and particularly relates to a sample injection method for analyzing the rare gas content in the gas collected by the drainage method. The method can effectively avoid air pollution to the sample gas, effectively dry the gas to be tested with high humidity, and accurately determine the rare gas content; a silicone plug (3), a sampling bottle (4), a sample injection needle (5), a first metal valve (6), a spiral cold trap (7), a second full metal valve (8), a quick seal joint (9), a third metal valve(10), a capacitance gauge (11), a stainless steel gas dilution tank (12), a fourth metal valve (13), a molecular pump set (14), a fifth metal valve (15), a small volume container (16), a sixth metalvalve (17) and a gas purification system (18) are included; the sample injection needle (5) comprises a stainless steel needle (19) and a CF16 stainless steel flange (20).

Description

technical field [0001] The invention belongs to the technical field of measuring rare gas content in gas samples, and in particular relates to a sampling system and a sampling method for collecting gas by a drainage method. Background technique [0002] As a traditional gas collection method, the drainage method has the advantages of simple operation and high sampling efficiency. The gas is collected into the glass bottle. After the collection is completed, the glass bottle is sealed and inverted with a rubber stopper, and the gas is sealed at the bottom of the glass bottle by the dual functions of saturated saline and the rubber stopper. [0003] Drainage method to collect the rare gas in the gas. The traditional sampling analysis method is to put the glass bottle upright, the gas is driven to the bottle mouth of the glass bottle, and the syringe needle is used to pass through the rubber stopper to transfer the gas into the syringe, and then pull out the syringe. , Transfe...

AI Technical Summary

Problems solved by technology

There are two main problems in this method: 1) before the syringe needle is inserted into the bottle, the air inside the needle will pollute the sample gas. Because the content of argon in the air is high (about 9320ppm), even a small amount of air, It will also have a significant impact on the content analysis of rare gases in the sample gas, especially argon; 2) Since the gas is sealed with saturated saline, there is a large amount of water vapor in the gas, which will seriously affect the vacuum of the purification system , which in turn affects the purification of the gas, and it is difficult to effectively remove water vapor by injecting the syringe directly into the purification system

Images