A portable gas chromatograph with air carrier gas for the determination of explosive traces

Балдин, М. Н.; Gruznov, V. M.

doi:10.1134/s1061934813110026

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…To measure signals from concentrators, we used portable express multicapillary gas chromatographs (GC) of the EKHO series containing a device for sample injection from the considered mesh concentrators [3,5,8]. Express and highly sensitive chromatographs are designed to detect explosives.…”

Section: Resultsmentioning

confidence: 99%

“…The express accumulation technology described above is implemented in EKHO type detectors [3,5,8]. For the two-mesh concentrator with its parameters: n = 2600, l = 0.028 cm, s = 0.5 and D = 0.2 cm 2 /s, flow Q = 280 cm 3 /s, calculation according to Equation (11) shows that, for the initial vapour concentration of 10 −14 g/cm 3 , a sufficient for detection amount of a substance is accumulated in 10 seconds (about 11 pg).…”

Section: Discussionmentioning

confidence: 99%

“…The described approach to determining the parameters of mesh concentrators for the modes of express accumulation of substance on a concentrator and complete capture was used in portable gas chromatographic detectors of explosive vapours of the EKHO series [3,5,8].…”

Section: Discussionmentioning

confidence: 99%

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Gas-Dynamic Kinetics of Vapour Sampling in the Detection of Explosives

Gruznov

Vorozhtsov

2019

Molecules

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The dynamic sorption concentration of explosive vapours on concentrators made of a metal mesh, and the transportation of explosive vapours through the extended metal channels are considered. The efficiency of the concentration and transportation is determined by the breakthrough of the substance’s molecules through the channels. The research methods we used were breakthrough calculation theory and experiment. When calculating the breakthrough, a mesh was presented as a set of parallel identical channels. Wire mesh and extended channels were made of stainless steel. The breakthrough is determined through the specific frequency of the collisions between the molecules and the channel’s surface. This is presented as a function of the ratio of the substance diffusion flow to the channel’s surface to the airflow through the channel. The conditions for high-speed concentration, complete capture of explosive vapours, and low vapour losses during their transportation through the extended channels were determined theoretically and experimentally. For a concentrator made of a mesh, the condition of a high concentration rate at a high breakthrough (up to 80%) was determined. The described sorption concentration is used in portable gas chromatographic detectors of explosive vapours of the EKHO series.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Gas-Dynamic Kinetics of Vapour Sampling in the Detection of Explosives

Gruznov

Vorozhtsov

2019

Molecules

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“…Близкий аналог устройства ввода с концентратора без кранов-переключателей, но и без газодинамической изоляции ПКК с короткими временами нагрева концентратора и ввода пробы используется в газовых хроматографах серии «ЭХО» [12]. Там устройство ввода с концентратора из металлических сеток [13] с малым объемом камеры ввода не более 0.1 см 3 соединяется с ПКК через тонкий капилляр и нагрев концентратора происходит за 1-3 секунды с последующим секундным вводом в ПКК. Такие короткие времена обеспечивают высокую эффективность термодесорбционного ввода пробы.…”

Section: экспериментальная частьunclassified

Sample injection of aromatic compounds from passive concentrators into multicapillary column by the thermal desorption method

Gruznov¹,

Балдин²,

Malysheva³

2019

АиК

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В настоящее время возрос интерес к геохимическим методам поиска залежей углеводородов по выявлению на поверхности Земли ореолов углеводородов, мигрирующих из залежей, в частности ароматических углеводородов: бензола, толуола, ксилолов. Концентрации мигрирующих углеводородов на поверхности Земли, как правило низкие, и находятся на уровне пороговых значений для газоаналитических приборов. Поэтому для их регистрации применяют концентрирование, в частности пассивное. Для этого используют концентраторы, закладываемые на небольшие глубины на разведываемой площади. В технологии съёмки, разрабатываемой авторами, используются многоразовые концентраторы в виде трубок из нержавеющей стали с сорбентом на основе силоксана SE-30, нанесенного на внутреннюю поверхность. Концентраторы в аналитических контейнерах закладываются в грунт на 1-2 суток. Анализ проб с концентраторов осуществляется на портативном поликапиллярном газовом хроматографе в полевых условиях. Статья посвящена специальному устройству ввода пробы с пассивных концентраторов и экспериментальному определению оптимального режима термодесорбционного ввода пробы с концентраторов в поликапиллярную колонку. Приведена оригинальная схема ввода, в которой реализована газодинамическая изоляция камеры устройства ввода и поликапиллярной колонки во время нагрева концентратора и анализа пробы, определено оптимальное время нагревания концентратора и время ввода пробы. Ключевые слова: пассивные концентраторы, ввод методом термической десорбции, газодинамическая изоляция устройства ввода и колонки.

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“…[7][8][9][10][11][12][13] But at the same time, the new challenge has emerged, sensors in practical applications encounters the new problems. For example, in space projects such as satellite launch and interstellar exploration represented by the Gaofen-5 satellite and the Shenzhou series spacecraft, how to control the volume and weight of gas analysis instruments to save fuel and transportation costs is a major aspect of sensor design 14,15 ; in some survey sites with complex environment, high requirements are put forward for the stability and environmental adaptability of sensors to complete accurate measurement tasks [16][17][18] ; in the actual monitoring of flammable and explosive dangerous gases, it is necessary to accurately predict the distribution of gas concentration in a wide range by using distributed gas sensors which need multi-point measurement. 19 Therefore, the development of sensors that adapt to the increasingly harsh working environment has gradually become the mainstream of gas sensing research.…”

Section: Introductionmentioning

confidence: 99%

Advances in fiber‐based quartz enhanced photoacoustic spectroscopy for trace gas sensing

Feng

Gao

et al. 2021

Micro & Optical Tech Letters

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Fiber-based quartz enhanced photoacoustic spectroscopy (QEPAS) is a method for trace gas sensing with excellent properties such as high sensitivity and strong applicability. It has received extensive attention and become particularly attractive in recent years. Therefore, this invited paper analyzed and summarized the principle of its sensing as well as its technical characteristics. The latest research results, combed with the application mechanism and application fields of different types of QEPAS system, were introduced. Finally, its development trend was forecasted.

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A portable gas chromatograph with air carrier gas for the determination of explosive traces

Cited by 12 publications

References 2 publications

Gas-Dynamic Kinetics of Vapour Sampling in the Detection of Explosives

Gas-Dynamic Kinetics of Vapour Sampling in the Detection of Explosives

Sample injection of aromatic compounds from passive concentrators into multicapillary column by the thermal desorption method

Advances in fiber‐based quartz enhanced photoacoustic spectroscopy for trace gas sensing

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