18-03-2013 | Microchemical Journal, 2013

May 2013 Publication year: 2013Source:Microchemical Journal, Volume 108 We report the instrumentation of a μ-GC system that was capable of performing real-time analysis of sub-ppb-levels of organic mixture vapors. This system consists of a multi-stage preconcentrator/injector, a ...

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29-10-2012 | Rih-Sheng Jian, Yi-Shiaw Huang, Shih-Lung Lai, Lung-Yu Sung, Chia-Jung Lu, Microchemical Journal, 2012

We report the instrumentation of a μ-GC system that was capable of performing real-time analysis of sub-ppb-levels of organic mixture vapors. This system consists of a multi-stage preconcentrator/injector, a capillary column with at-column heater configuration and a photo ionization detector ...

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18-07-2012 | Jung Hwan Seo; Jing Liu; Xudong Fan; Katsuo Kurabayashi, Analytical Chemistry, 2012

Microscale gas chromatography (μGC) is an emerging analytical technique for in situ analysis and on-site monitoring of volatile organic compounds (VOCs) in moderately complex mixtures. One of the critical subcomponents in a μGC system is a microfabricated preconcentrator (μ-preconcentrator), ...

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10-04-2012 | Jing Liu; Maung Kyaw Khaing Oo; Karthik Reddy; Yogesh B. Gianchandani; Jack C. Schultz; Heidi M. Appel; Xudong Fan, Analytical Chemistry, 2012

We proposed and investigated a novel adaptive two-dimensional (2-D) microgas chromatography system, which consists of one 1st-dimensional column, multiple parallel 2nd-dimensional columns, and a decision-making module. The decision-making module, installed between the 1st- and 2nd-dimensional ...

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30-08-2011 | Badaoui Omais; Marion Courtiade; Nadège Charon; Jérémie Ponthus; Didier Thiébaut, Analytical Chemistry, 2011

The term “orthogonal” in comprehensive two-dimensional gas chromatography (GC × GC) has a double sided meaning as it stands for a separation resulting from the combination of two independent retention mechanisms (Giddings, J. C. J. High Resolut. Chromatogr.1987, 10, 319) but also for a 2D ...

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24-06-2011 | Ronald P. Manginell; Joseph M. Bauer; Matthew W. Moorman; Lawrence J. Sanchez; John M. Anderson; Joshua J. Whit ..., Sensors, 2011

Gas chromatography (GC) is used for organic and inorganic gas detection with a range of applications including screening for chemical warfare agents (CWA), breath analysis for diagnostics or law enforcement purposes, and air pollutants/indoor air quality monitoring of homes and commercial ...

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06-12-2010 | Berhane T., Weldegergis , André de, Villiers , Christopher, McNeish , Suresh, Seethapathy , Ahmed, Mostafa , ..., Food Chemistry, 2010

As part of the ongoing research into the chemical composition of the uniquely South African wine cultivar Pinotage, the volatile composition of nine young wines of this cultivar was investigated using comprehensive two-dimensional gas chromatography (GC × GC) in combination with ...

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01-12-2010 | Molever, K., International Journal of Cosmetic Science, 2010

The FDA has recently taken steps to reduce risks due to raw materials affected by economically motivated adulteration (EMA). One area of great interest is diethylene glycol (DEG) or ethylene glycol (EG) adulteration of glycerin, propylene glycol, and solutions of sorbitol, for which the USP ...

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27-11-2010 | Jian-Liang Cao, Yan Wang, Guang Sun, Zhan-Ying Zhang, Transition Metal Chemistry, 2010

Cex Sn1−x O2 metal oxides were prepared by a citrate method and used as supports for CuO/Cex Sn1−x O2 catalysts. The as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy, high-resolution TEM, and temperature-programmed reduction techniques. XRD ...

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20-10-2010 | Jianliang Cao, Yan Wang, Jianchao Shi, Guang Sun, Zhanying Zhang, Journal of Porous Materials, 2010

Mesoporous ZrO2 was synthesized by a simple surfactant-assisted method in the presence of the cationic surfactant cetyltrimethylammonium bromide, and the CuO loaded catalysts CuO/ZrO2 were prepared by a deposition–precipitation method. The obtained products were characterized by means of ...

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