Sampling and desorption device

Abstract

The invention discloses a sampling and desorption device, which comprises a sampling section and a desorption section, wherein the sampling section comprises a first housing, a push handle, a piston,a sampling probe clamping structure and a sampling probe. The first housing is a cylindrical structure; the piston is movably installed in the first housing; the push handle and the sampling probe clamping structure are arranged at the two sides of the piston respectively; one end of the sampling probe is detachably fixed in the sampling probe clamping structure; the sampling probe and the push handle are parallel to the axis of the first housing; the sum of axial lengths of the piston and the sampling probe is smaller than the axial length of the first housing; and the sum of the axial lengths of the push handle, the piston, and the sampling probe is greater than the axial length of the first housing. The end, close to the sampling probe, of the first housing cooperates with the desorption section; and the desorption section provides a space for accommodating the sampling probe and performing heating desorption.

Description

technical field [0001] The invention belongs to the technical field of mass spectrometer samplers, and in particular relates to a sampling and desorption device. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, there are many methods for the detection of pesticide residues in agricultural products. Among them, the following methods are more commonly used: the first is to use instruments such as liquid chromatography or gas chromatography, and the samples to be detected have to go through complicated pretreatment steps. For example, first crush the agricultural product sample, add solvent for extraction, inject the extract into the activated solid phase extracti...

AI Technical Summary

Problems solved by technology

However, after the test is completed, it is generally simply burned, and then the next test is performed, which is difficult to avoid causing interference to subsequent tests

Moreover, there is no fixed container for holding the probe. When placed casually, on the one hand, it is easy to cause the force deformation of the probe, and on the other hand, it is easy to be polluted, which affects the accuracy of detection.

In addition, when this method is heated and desorbed, a certain flow rate of carrier gas needs to be introduced. The inventors found that due to the low temperature of the carrier gas, the heating and desorption effect of the pesticide on the probe will be affected during the feeding process, which in turn will affect the quality of agricultural products. Accuracy of Surface Pesticide Detection

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