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Head space sample introduction device and gas chromatograph including same

A technology for introducing devices and samples, which is applied in the field of gas chromatography, and can solve the problems of reduced reproducibility of measurement results, insufficient analysis sensitivity, and reduced concentration of sample components.

Active Publication Date: 2015-04-29
SHIMADZU SEISAKUSHO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a sampling method for sampling the sample gas into the sample loop, the sample gas is usually collected from the sample loop when the pressure at the other end of the sample loop connected to the head space of the sample container at one end becomes atmospheric pressure, but in the sample The concentration of the sample components decreases under atmospheric pressure in the loop, so there are cases where the analytical sensitivity is insufficient
[0004] It is also possible to switch the valve to collect the sample gas from the sample loop when the pressure in the sample loop drops to a predetermined pressure before atmospheric pressure. The operation of the valve is switched by predicting the time of the specified pressure, and in the method of switching the valve when the pressure changes, the concentration of the sample gas collected varies due to the switching timing, so the reproducibility of the measurement results is reduced.

Method used

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  • Head space sample introduction device and gas chromatograph including same
  • Head space sample introduction device and gas chromatograph including same
  • Head space sample introduction device and gas chromatograph including same

Examples

Experimental program
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Embodiment Construction

[0030] figure 1 One example of the sample introduction device is shown. The sample container 2 accommodates a liquid or solid sample 4 therein, and generates a sample gas from the sample 4 by heating. The sample container 2 is sealed by the diaphragm 6, and the space above the sample 4 in the sample container 2 becomes the head space 3 for accumulating the generated sample gas. The diaphragm 6 is fixed by the cap 5 so that the inside of the sample container 2 can be pressurized to a pressure higher than the atmospheric pressure, for example, 50 to 200 kPa higher than the atmospheric pressure.

[0031] In order to generate a sample gas from the sample 4, the sample container 2 is heated at a constant temperature for a constant time. The heating temperature is set according to the sample gas to be measured, and is, for example, 35 to 300°C. The sample components having a boiling point equal to or less than the preset temperature volatilize and are stored in the headspace 3 as...

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Abstract

A pressurization passage that divides a constant pressure from a pressure source with passage resistances so as to have a predetermined constant pressure is disposed on a downstream side of a sample loop in order to maintain a back pressure of the sample loop constant when a sample gas is collected to the sample loop.

Description

technical field [0001] The present invention relates to a headspace sample introduction device that collects a gas sample volatilized from a liquid sample or a solid sample by the headspace method and introduces it to an analysis device such as a gas chromatograph, and a headspace sample introduction device equipped with the same A gas chromatograph as an example of an analysis device. Background technique [0002] The headspace method refers to heating a liquid sample or a solid sample contained in a sample container at a constant temperature for a constant time to volatilize components with a low boiling point, and collect samples from the head space (upper space) in the sample container. A sample introduction method in which a constant amount of gas containing the above components is introduced into an analyzer. In addition, the headspace analysis method refers to a method in which a sample is introduced into an analysis device by the headspace method and analyzed. A ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/04G01N30/00G01N30/32
CPCG01N30/32G01N2030/207G01N30/24G01N2030/009G01N2030/065G01N2030/202G01N1/22G01N30/16G01N2030/025
Inventor 青野晃
Owner SHIMADZU SEISAKUSHO LTD
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