Sealed headspace gas chromatographic device suitable for radioactive sample analysis
A headspace gas chromatography and sample analysis technology, which is applied in the field of closed headspace gas chromatography devices, can solve the problems of large gas chromatography volume, condensation of analytes, modification of sealing and hindering the application of gas chromatography, etc. Effect
Pending Publication Date: 2019-04-02
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology
However, the gas chromatograph is equipped with functions such as heating, heat preservation, and heat dissipation. After the instrument is disassembled and modified, the analyte carried by the carrier gas is easy to condense in the pipeline and cannot be detected.
At the same time, the volume of the gas chromatograph is relatively large, and the operation of sample injection is meticulous, and it is not suitable for the entire instrument to be closed in a glove box for operation.
The above-mentioned difficulties in reforming and sealing have hindered the application of gas chromatographs in the measurement of radioactive samples. At present, there is no precedent for the application of gas chromatographs in a closed environment.
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[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0016] The present invention realizes the application of the gas chromatograph in radioactive sample measurement by changing the sample pretreatment and sampling method, reduces the radioactivity level of the sample through pretreatment, and takes the separated analyte out of the glove box for further to the chromatographic column, so headspace sampling and injection techniques are used. Headspace sampling is a gas phase extraction method that uses gas as a "solvent" to extract volatile components in a sample. Therefore, headspace sampling is also a method of sample purification. Use a sampling needle to draw the gas phase above the sample matrix for chromatographic analysis. This method can purify the sample and greatly reduce the radioactive level of the analyte. However, it is difficult to transfer the sample out of the glove box after headspace s...
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The invention relates to a sealed headspace gas chromatographic device suitable for radioactive sample analysis. The device comprises a headspace sample injection device enclosed in a special glove box; the headspace sample injection device is connected with a gas chromatograph disposed in a ventilation cabinet through a transmission line with heating and heat preservation functions; after a radioactive sample is subjected to headspace treatment in the headspace sample injection device, a to-be-detected object enters the gas chromatograph through the transmission line for measurement. According to the sealed headspace gas chromatographic device suitable for radioactive sample analysis, the headspace sample injection device is sealed and is connected with the gas chromatograph in the ventilation cabinet through the transmission line with heating and heat preservation functions, thereby solving the problem of measurement of an organic matter in the radioactive sample; and the gas chromatographic measurement is applied to measurement of the organic matter in the radioactive sample, thereby broadening the application range of the gas chromatograph.
Description
technical field [0001] The invention belongs to radioactive sample analysis technology, in particular to a closed headspace gas chromatography device suitable for radioactive sample analysis. Background technique [0002] The measurement of organic substances in radioactive samples is a difficult problem in analysis. For the measurement of organic substances, gas chromatography is a commonly used analytical instrument. In the reprocessing of nuclear fuel, volatile substances in non-radioactive samples and derivatization into volatile substances The analysis also has research applications. However, the application of gas chromatography to the analysis of organic matter in radioactive samples requires modification and sealing of the instrument. However, the gas chromatograph is equipped with functions such as heating, heat preservation, and heat dissipation. After the instrument is disassembled and modified, the analytes carried by the carrier gas are easily condensed in the ...
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IPC IPC(8): G01N30/88
CPCG01N30/88
Inventor 陶苗苗谈树苹张彤
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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