Thermal desorption instrument and gas chromatograph sample desorption method
A thermal desorber, standard sample technology, applied in the field of analytical instruments, can solve problems such as peak shape distortion, heating voltage safety hazards, clogging and other problems
Active Publication Date: 2018-12-25
北京捷思达仪分析仪器研发中心
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Problems solved by technology
However, the above technologies have exposed some problems after practice. Among them, the heating and cooling speed of the heating block is slow, and the heating voltage of 220V is prone to safety hazards due to aging leakage. The six-way valve is easily contaminated and damaged during use, and it is difficult to clean.
In addition, due to the long sampling pipeline and poor heat preservation, the thermal desorption gas is easily adsorbed in the valve and on the pipeline, causing blockage, lower detection sensitivity, and peak shape distortion.
Method used
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Embodiment Construction
[0030] The thermal desorption instrument of the present invention will be described in detail below in conjunction with the diagrams.
[0031] Such as figure 1 As shown, the thermal desorption instrument of the present invention mainly includes a heater 1, and a sampling tube 8 with an adsorber 81 inside is inserted into the heater 1 for heating. The heating area of the heater 1 is a cylindrical through hole surrounded by a heating wire 11. The tail end of the sampling tube 8 is connected to the fixing device 2 through the sampling tube tee, and connected to the hose I3 through the fixing device 2, and the other end of the hose I3 is connected to the air source. A switching valve I4 is installed on the pipeline.
[0032] The front end of the sampling tube 8 is inserted into the conversion valve 6, and there are three passages 6a, 6b, 6c inside the conversion valve 6, and the three passages communicate with each other, but do not converge at one point. The channel 6a in the...
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The invention relates to a thermal desorption instrument. The thermal desorption instrument comprises a heater; a sampling tube is inserted into the heater and connected with a fixing device through a sampling tube tee joint; the fixing device fixedly connects a flexible tube III to the sampling tube; the flexible tube III is connected with a gas source through a switching valve I; a sample introduction end of the sampling tube is inserted into the switching valve; the interior of the switching valve is provided with three mutually communicated pathways connected with a standard sample injection end; a flexible tube II and a sample introduction device are mutually communicated; and the flexible tube II is connected with the gas source through the switching valve. According to the invention, one-needle direct sample introduction is employed, three pipe heating is adopted, and gas heated and desorbed by the sampling tube can rapidly enter a gas chromatograph via the switching valve due to short structure process, so detection sensitivity is greatly improved and a desorption rate is increased accordingly. The thermal desorption instrument does not need cleaning and a failure rate is decreased.
Description
technical field [0001] The invention relates to the field of analytical instruments, in particular to a thermal desorption instrument. Background technique [0002] For the heating and desorption treatment of the thermal analysis sampling tube, the common methods on the market are heating block preheating, automatic or manual six-way valve switching. However, the above technologies have exposed some problems after practice. Among them, the heating block heating and cooling speed is slow, the heating voltage of 220V is easy to cause safety hazards due to aging leakage, and the six-way valve is easy to be polluted and damaged during use, and it is difficult to clean. Moreover, due to the long sampling pipeline and poor heat preservation, the thermal desorption gas is easily adsorbed in the valve and on the pipeline, causing blockage, lower detection sensitivity, and peak shape distortion. Contents of the invention [0003] The technical problem to be solved by the present i...
Claims
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IPC IPC(8): G01N1/44G01N30/06
Inventor 刘钟
Owner 北京捷思达仪分析仪器研发中心