Operational theory and instrumental implementation of the thermal gradient programmed gas chromatography (TGPGC) mode of analysis

In chemichal-toxicological analysis was used the method of Gas Chromatography-Mass Spectrometry. It is considered as one of the most exact method of analysis of chemichal substances. Respectively utilization of this method in determination of widely spread narcotic in biological fluids is important task. As a result of experimental work, was determined optimal conditions of analysis: temperature of injector, fuel and transferline, the thermal gradient, volume of injection, length of the column, thickness of the layer, gass-wearing speed of mobile phase. Detection of Desomorphine was carried by TIC and SIM regime, under the NIST data base. For derivatisation was selected acitilation (acetate anhydride), metilation and sylitation were performed. The optimal sylitation of tetrahydrocanabinol and 11nor-terahydrocanabinol carboxyacide was performed by BSTFA. In the current work is presented the chromatograme and mass-specter of tetrahydrocanabinol and 11-nor-terahydrocanabinol carboxyacide detected in urine.

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An instrumentation assembly for studying operational behavior of thermal gradient programmed gas chromatography

Review of Scientific Instruments ◽

10.1063/1.1144619 ◽

1994 ◽

Vol 65 (9) ◽

pp. 2802-2807 ◽

Cited By ~ 3

Author(s):

Wayne A. Rubey

Keyword(s):

Gas Chromatography ◽

Thermal Gradient

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Comparison of the Dynamic Thermal Gradient to Temperature-Programmed Conditions in Gas Chromatography Using a Stochastic Transport Model

Analytical Chemistry ◽

10.1021/acs.analchem.1c02210 ◽

2021 ◽

Vol 93 (34) ◽

pp. 11785-11791

Author(s):

Samuel Avila ◽

H. Dennis Tolley ◽

Brian D. Iverson ◽

Aaron R. Hawkins ◽

Shawn L. Johnson ◽

...

Keyword(s):

Gas Chromatography ◽

Thermal Gradient ◽

Transport Model ◽

Stochastic Transport ◽

Temperature Programmed

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Fission Gas Bubbles in Fractured UO2

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100101177 ◽

1968 ◽

Vol 26 ◽

pp. 286-287

Author(s):

O. M. Katz

Keyword(s):

Electron Microscopy ◽

Thermal Gradient ◽

Gas Bubbles ◽

Inert Gas ◽

Thermal Gradients ◽

Fission Gas ◽

Beam Heating ◽

Limited Application ◽

Bubble Characteristics ◽

Electron Beam Heating

The swelling of irradiated UO2 has been attributed to the migration and agglomeration of fission gas bubbles in a thermal gradient. High temperatures and thermal gradients obtained by electron beam heating simulate reactor behavior and lead to the postulation of swelling mechanisms. Although electron microscopy studies have been reported on UO2, two experimental procedures have limited application of the results: irradiation was achieved either with a stream of inert gas ions without fission or at depletions less than 2 x 1020 fissions/cm3 (∼3/4 at % burnup). This study was not limited either of these conditions and reports on the bubble characteristics observed by transmission and fractographic electron microscopy in high density (96% theoretical) UO2 irradiated between 3.5 and 31.3 x 1020 fissions/cm3 at temperatures below l600°F. Preliminary results from replicas of the as-polished and etched surfaces of these samples were published.

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