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Characterization of Modified Silica Gel as a Source of Ethene for Standard Gaseous Mixtures

✍ Scribed by M. Prokopowicz; A. Przyjazny; Y. Szczygelska-Tao; J.F. Biernat; J. Namieśnik

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 134 KB
Volume: 59
Category: Article
ISSN: 0026-265X
DOI: 10.1006/mchj.1998.1631

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✦ Synopsis

The application of chemically modified silica gel as a source of gaseous standard mixture containing ethene as a measured component is described. The surface of silica gel was chemically modified, which resulted in the formation of N-oxide of diethylaminopropylsilylated silica gel. This compound undergoes thermal decomposition at 245°C, yielding known amounts of ethene. The process of thermal decomposition of chemically modified silica gel took place in a desorber furnace connected on-line via a four-port valve to the device being calibrated. Such a solution provides convenient calibration of a GC/FID system after direct introduction of a stream of the generated mixture onto the front of a GC. It was found that 480 Ϯ 15 mg of ethene can be generated per 1 g of the modified gel.

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