Direct capillary tube sample injection device and method

Abstract

The invention discloses a direct capillary tube sample injection device and method. The device comprises a capillary tube, a droplet absorbing and diffusing material and a refrigerating part, whereinthe refrigeration part comprises a refrigeration material and a sample injection pipeline, one end of the capillary tube is a sample injection port and extends into a to-be-detected aqueous solution sample when in use, the other end is a sample outlet port, extends into a sample inlet pipe of the refrigeration part and is in contact with the droplet absorbing and diffusing material arranged in thesample inlet pipe, the droplet absorbing and diffusing material is used for absorbing liquid drops from a sample outlet of the capillary tube, so sample liquid drops are diffused from the liquid dropabsorbing and diffusing material and volatilized to enter the sample inlet pipe, the exterior of the sample inlet pipe is in contact with a refrigeration material, so at least a part of water vapor in the to-be-detected sample volatilized into the sample inlet pipe is condensed and crystallized, and an outlet of the sample inlet pipe is communicated with a detection cavity of a detection instrument. The device is advantaged in that the content of water entering the instrument can be effectively reduced, and VOC detection efficiency is improved.

Description

technical field [0001] The invention relates to the field of detection of volatile organic compounds in aqueous solution, in particular to a direct capillary sampling device and method in the detection process. Background technique [0002] Volatile organic compounds (VOC) usually refer to organic compounds with a boiling point lower than or equal to 250°C and a saturated vapor pressure greater than or equal to 0.01kPa at room temperature. Such organic compounds have the characteristics of various types, complex components, and strong mobility. VOC is highly volatile, and its content in water is usually very low, but even trace amounts of components can cause great harm to the human body. With the rapid development of industry and economy, a large number of polluting organic compounds produced in the industrial production process penetrate into the water environment through various channels, and the detection of VOC in aqueous solutions has attracted more and more attention ...

AI Technical Summary

Problems solved by technology

[0005] In the direct capillary sampling method, if the injection volume of water is too large, the vacuum environment of the detection instrument will be destroyed, thereby affecting the ionization source and analyzer, which will affect the detection efficiency of VOC.

The main purpose of the present invention is to propose a direct capillary s

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