標題: Fizzy Extraction of Volatile and Semivolatile Compounds into the Gas Phase
作者: Chang, Cheng-Hao
Urban, Pawel L.
應用化學系
Department of Applied Chemistry
公開日期: 6-九月-2016
摘要: Extraction of volatile and semivolatile compounds from liquid matrixes with high yields, and transferring the extracts to detectors in real time, is challenging. Common extraction procedures involve heating the samples to release the analytes to the gas phase and, in some cases, trapping the gas-phase analytes into sorbents or containers. Here, we propose a new method for fast extraction of volatile and semivolatile compounds from liquid matrixes. This method involves dissolution of a carrier gas in the liquid sample by applying a moderate overpressure (similar to 150 kPa) and stirring the sample. An abrupt decompression of the extraction chamber leads to effervescence. In this step, many bubbles are instantly formed in the sample matrix. The dissolved carrier gas as well as dissolved volatiles are liberated into the headspace of the extraction chamber within a short period of time (few seconds). The gaseous effluent of the extraction chamber is immediately transferred to the online detector; in this case, an atmospheric pressure chemical ionization interface of a triple quadrupole mass spectrometer. The fast release of the gas-phase extract gives rise to a high signal recorded by the detector; several times higher than the signal recorded during direct infusion of headspace vapors without fizzy extraction. This feature provides the means to detect and quantify analytes present in solutions in a short period of time. Here we show that fizzy extraction is suitable for analysis of volatile/semivolatile compounds present in various samples, including those containing complex matrixes.
URI: http://dx.doi.org/10.1021/acs.analchem.6b02074
http://hdl.handle.net/11536/134242
ISSN: 0003-2700
DOI: 10.1021/acs.analchem.6b02074
期刊: ANALYTICAL CHEMISTRY
Volume: 88
Issue: 17
起始頁: 8735
結束頁: 8740
顯示於類別:期刊論文