Results 181 to 190 of about 8,462 (221)
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2023
Воздух является возможной средой для распространения химических веществ, которые могут оказывать неблагоприятное воздействие на население, загрязняя не только аграрные территории, но и отдаленные районы, в том числе городские. В работе представлены результаты исследований по валидации метода измерения содержания в атмосферном воздухе системного ...
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Воздух является возможной средой для распространения химических веществ, которые могут оказывать неблагоприятное воздействие на население, загрязняя не только аграрные территории, но и отдаленные районы, в том числе городские. В работе представлены результаты исследований по валидации метода измерения содержания в атмосферном воздухе системного ...
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Analytical Chemistry, 2009
A variety of sorbents is available for the sampling of airborne organic pollutants. However, choosing the right sorbent for a certain analytical target is still a challenge. Here we present a systematic sorption study for a diverse set of up to 200 compounds at temperatures between 40 and 250 degrees C for four frequently used sorbents: Tenax TA ...
Martina, Schneider, Kai-Uwe, Goss
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A variety of sorbents is available for the sampling of airborne organic pollutants. However, choosing the right sorbent for a certain analytical target is still a challenge. Here we present a systematic sorption study for a diverse set of up to 200 compounds at temperatures between 40 and 250 degrees C for four frequently used sorbents: Tenax TA ...
Martina, Schneider, Kai-Uwe, Goss
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Low pressure drop micro preconcentrators with cobweb Tenax-TA film for analysis of human breath
2011 IEEE 24th International Conference on Micro Electro Mechanical Systems, 2011This paper reports the design, simulation, and experimental evaluation of high performance low pressure drop (<100Pa/cm) micropreconcentrator (µPC) chips (12mm×12mm×1mm) for handheld breath analyzers. The µPC's high performance is attributed to the multiple inlets/outlets, novel high-aspect-ratio (360µm) parabolic reflectors, and cobweb ...
B. Alfeeli +3 more
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Talanta, 2009
Two sorbents commonly employed for air sampling were selected for the evaluation of their suitability for the analysis of combustion gases namely Tenax TA as adsorbent and polydimethylsiloxane (PDMS) as absorbent. Target compounds were selected among the gaseous combustion products of polyurethane foam and fire-retarded polystyrene.
Koen, Desmet +3 more
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Two sorbents commonly employed for air sampling were selected for the evaluation of their suitability for the analysis of combustion gases namely Tenax TA as adsorbent and polydimethylsiloxane (PDMS) as absorbent. Target compounds were selected among the gaseous combustion products of polyurethane foam and fire-retarded polystyrene.
Koen, Desmet +3 more
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Journal of Chromatography A, 1995
Abstract The breakthrough volumes (BTV) of several monoterpenes (α- and s-pinene, myrcene, sabinene, Δ3-carene and limonene) on Tenax TA were determined at very low mixing ratios (0.2–30 ppb, v/v). α-Pinene, which exhibits the lowest BTV of all terpenes studied (16.3 l g−1 at 34°C for a mixing ratio of 3 ppb, v/v) was taken as a standard during the ...
Valérie Simon +3 more
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Abstract The breakthrough volumes (BTV) of several monoterpenes (α- and s-pinene, myrcene, sabinene, Δ3-carene and limonene) on Tenax TA were determined at very low mixing ratios (0.2–30 ppb, v/v). α-Pinene, which exhibits the lowest BTV of all terpenes studied (16.3 l g−1 at 34°C for a mixing ratio of 3 ppb, v/v) was taken as a standard during the ...
Valérie Simon +3 more
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Comparison of Tenax Ta and Carbotrap for sampling and analysis of volatile organic compounds in air
Atmospheric Environment. Part B. Urban Atmosphere, 1991Abstract Dynamic recovery data with a simple test system show that many volatile organic compounds (VOC) found in trace amounts in air can be determined quantitatively by adsorption on Tenax TA or Carbotrap and thermal desorption. Tenax TA seems to be inert towards the compounds tested as opposed to Carbotrap, on which α-pinene and aldehydes show ...
Heinz Rothweiler +2 more
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Environmental Technology, 1995
In order to assess the ideal range of volatile organic compounds (VOCs) that can be quantitatively retained by Tenax TA during long term environmental diffusion monitoring and obtain an estimate of any sampling bias that maybe present, an experiment was devised whereby long term diffusive monitoring, using 7 and 14 day exposure times, was compared to ...
Nicholas M. Bradshaw +1 more
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In order to assess the ideal range of volatile organic compounds (VOCs) that can be quantitatively retained by Tenax TA during long term environmental diffusion monitoring and obtain an estimate of any sampling bias that maybe present, an experiment was devised whereby long term diffusive monitoring, using 7 and 14 day exposure times, was compared to ...
Nicholas M. Bradshaw +1 more
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Environmental Science & Technology, 2002
The degradation of the adsorbent Tenax TA was studied qualitatively by sampling oxidants common in indoor air followed by thermal desorption and gas chromatography. A total of 25 degradation products were identified. Several degradation products not reported previously were identified: 9 for nitrogen dioxide; 11 for ozone; 2 for hydrogen peroxide; 12 ...
Jacob G, Klenø +4 more
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The degradation of the adsorbent Tenax TA was studied qualitatively by sampling oxidants common in indoor air followed by thermal desorption and gas chromatography. A total of 25 degradation products were identified. Several degradation products not reported previously were identified: 9 for nitrogen dioxide; 11 for ozone; 2 for hydrogen peroxide; 12 ...
Jacob G, Klenø +4 more
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Journal of Forensic Sciences, 2006
ABSTRACT: The aim of research was to compare two adsorbents, Tenax TA® and Carbotrap 300®, to evaluate their usefulness as passive adsorbents of flammable liquids compounds. It was also to determine whether Carbotrap 300® could be used in a passive adsorption mode, contrary to manufacturer recommendations.
Rafał, Borusiewicz, Janina, Zieba-Palus
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ABSTRACT: The aim of research was to compare two adsorbents, Tenax TA® and Carbotrap 300®, to evaluate their usefulness as passive adsorbents of flammable liquids compounds. It was also to determine whether Carbotrap 300® could be used in a passive adsorption mode, contrary to manufacturer recommendations.
Rafał, Borusiewicz, Janina, Zieba-Palus
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Atmospheric Environment, 1997
Abstract Analyses of indoor air samples of semivolatile organic compounds (SVOCs) from five offices in two office buildings, a school classroom, and a room in a day-care center were generally strongly influenced by artifact formation. In the laboratory, the major artifacts could be produced by sampling mixtures of O 3 , NO 2 , and limonene in air on ...
Per Axel Clausen, Peder Wolkoff
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Abstract Analyses of indoor air samples of semivolatile organic compounds (SVOCs) from five offices in two office buildings, a school classroom, and a room in a day-care center were generally strongly influenced by artifact formation. In the laboratory, the major artifacts could be produced by sampling mixtures of O 3 , NO 2 , and limonene in air on ...
Per Axel Clausen, Peder Wolkoff
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