Instrument sampling device of novel gas chromatograph

Abstract

The invention discloses a novel gas chromatograph instrument sample introduction device, which comprises a needle cylinder, a push rod is vertically and movably arranged in the needle cylinder, the push rod can extract liquid when moving upwards, the push rod can release liquid when moving downwards, the lower end of the needle cylinder is fixedly connected with a liquid outlet cylinder, and a needle head is installed at the lower end of the liquid outlet cylinder in a threaded manner. A limiting cylinder is clamped to the outer wall of the liquid outlet cylinder through a fixing assembly, the position of the limiting cylinder on the liquid outlet cylinder is adjustable, and the lower end of the limiting cylinder is connected with a positioning sleeve. Before a solution is extracted, the needle cylinder and the liquid outlet of the container can be connected, the stability of connection between the needle cylinder and the liquid outlet of the container is kept, and the operation is convenient. The risk of needle head bending is reduced, the accuracy of liquid suction quantification is improved, the test error is reduced, the service life of the needle head is further prolonged, the interior of the needle head can be timely and rapidly cleaned, the risk of needle head blocking is reduced, and the working efficiency is further improved.

Description

technical field [0001] The invention relates to the technical field of gas chromatographs, in particular to an instrument sampling device of a novel gas chromatograph. Background technique [0002] Gas chromatograph refers to a chromatographic analysis instrument that uses gas as the mobile phase. Gas chromatograph can usually be used to analyze organic compounds in soil with thermal stability and boiling point not exceeding 500℃, such as volatile organic compounds, polycyclic aromatic hydrocarbons, phthalates, etc. It has the advantages of rapidity, effectiveness and high sensitivity. When entering the chromatographic column, due to the different distribution coefficients of each component between the gas phase and the liquid phase of the stationary liquid in the chromatographic column, the running speed of each component in the chromatographic column is also different. After a certain column length, the components leave in sequence. The chromatographic column enters the d...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, when the sampling needle used for gas chromatograph is inserted into the container to take a sample, due to the instability of manual operation, the needle is prone to bending, which may lead to inaccurate liquid absorption and quantification, and bring errors to the test. , even lead to damage to the needle, and the needle of the existing sampling needle is relatively prone to clogging, and it is not convenient to clean the needle, which reduces the work efficiency, so we need to propose a new instrument sampling device for gas chromatograph

Images