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Sample introduction device and method for element form analysis based on thin-layer chromatography technology

A technology of element form and thin-layer chromatography, applied in the field of analytical chemistry, can solve the problems of complex optical path, high safety requirements, and cumbersome operation of laser ablation system, and achieve the effect of high safety, simple device structure and low cost

Pending Publication Date: 2019-12-31
TSINGHUA UNIV
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Problems solved by technology

At present, laser ablation and plasma desorption are the main methods for desorbing the element form on the thin-layer chromatography plate and introducing it into the analytical instrument for detection. However, the laser ablation system usually has a complicated optical path and high cost; High; and the operation of the two methods is relatively cumbersome

Method used

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  • Sample introduction device and method for element form analysis based on thin-layer chromatography technology
  • Sample introduction device and method for element form analysis based on thin-layer chromatography technology

Examples

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Effect test

Embodiment 1

[0037] Embodiment 1, the sampling device that is used for element speciation analysis based on thin-layer chromatography technology

[0038] The sampling device provided in this embodiment for element speciation analysis based on thin-layer chromatography technology includes a cuboid sample chamber 1 and a mobile heating device 3; the bottom surface of the sample chamber 1 is made of aluminum alloy, and the other five sides are made of organic glass. The situation in the sample chamber can be observed at any time during the experiment; the plexiglass plates are sealed with chloroform, and the plexiglass plate and the aluminum alloy plate are sealed with vacuum silicone grease; the two relative positions on the side wall of the sample chamber 1 are respectively There is an air inlet 2 and an air outlet 4, the air inlet 2 is used to input carrier gas, and the air outlet 4 can be connected with analytical instruments such as atomic fluorescence spectrometer, atomic absorption spec...

Embodiment 2

[0040] Embodiment 2, mercury form is analyzed

[0041] Use the device in the embodiment of the present invention 1 to cooperate with the inductively coupled plasma mass spectrometer (ICP-MS) to analyze the form of mercury, specifically as follows:

[0042] The two ends of the thin-layer chromatographic plate 10 that has completed the chromatographic separation of Hg form are fixed with the thin-layer chromatographic plate clip 5; after the plexiglass plate and the aluminum alloy plate of the sample chamber 1 are sealed and fitted by vacuum silicone grease, the carrier gas argon is released from the The air inlet 2 is connected, and its flow rate is controlled to be 600mL / min; the one-dimensional electric rotating platform is controlled by conventional computer software, and the heating head 11 is moved to the right below the chromatography spot on the thin-layer chromatography plate 10; the heating is controlled by computer software. The temperature of the head 11 is 150°C, the ...

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Abstract

The invention discloses a sample introduction device and method for element form analysis based on the thin-layer chromatography technology. The sample introduction device disclosed by the invention comprises a sealable sample chamber and a mobile heating device; an air inlet and an air outlet are respectively formed in two opposite walls of the sample chamber; and the mobile heating device is arranged in a cavity of the sample chamber, and the mobile heating device can move along a direction from the air inlet to the air outlet. The sample introduction method disclosed by the invention comprises the following steps: separating various forms of elements in a sample through thin-layer chromatography, and obtaining chromatographic spots on a thin-layer chromatography plate; and then heatingto desorb the element forms in the chromatographic spots, and importing the element forms into an analysis instrument to realize sample introduction of the element form analysis. By adopting the sample introduction device and method disclosed by the invention, the substance in the chromatographic spots can be heated and desorbed to perform sample introduction detection, the heating is more concentrated and efficient, and the substance can be desorbed quickly and efficiently; and the device has a simple structure, simple operation and a low cost.

Description

technical field [0001] The invention relates to a sampling device and method for analyzing element forms based on thin-layer chromatography technology, belonging to the technical field of analytical chemistry. Background technique [0002] The environmental effects of inorganic elements, especially trace heavy metals (such as arsenic, mercury, cadmium, chromium, lead, etc.) and the biological activity of trace elements are not only related to their total amount, but also determined by their forms to a greater extent. Environmental effects or availability are different. Element speciation analysis is of great significance for environmental hazard assessment, disease research, food safety, and standard formulation. Chromatography (gas chromatography, liquid chromatography, thin-layer chromatography, etc.), capillary electrophoresis, solid-phase extraction and other separation techniques to achieve the separation of different forms of elements is an indispensable step in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/90G01N30/91G01N1/44
CPCG01N30/90G01N30/91G01N1/44
Inventor 邢志李铭黄秀范博文
Owner TSINGHUA UNIV
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