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Titolo:
Development of membrane extraction with a sorbent interface-micro gas chromatography system for field analysis
Autore:
Segal, A; Gorecki, T; Mussche, P; Lips, J; Pawliszyn, J;
Indirizzi:
Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 em, Waterloo, ON N2L 3G1, Canada Chrompack, NL-4330 EA Middelburg, Netherlands Chrompack Middelburg Netherlands NL-4330 EA 0 EA Middelburg, Netherlands
Titolo Testata:
JOURNAL OF CHROMATOGRAPHY A
fascicolo: 1, volume: 873, anno: 2000,
pagine: 13 - 27
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLID-PHASE MICROEXTRACTION; WATER;
Keywords:
membrane extraction with a sorbent interface; membranes; extraction methods; benzene; toluene; ethylbenzene; xylenes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Pawliszyn, J Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 ON N2L 3G1, Canada
Citazione:
A. Segal et al., "Development of membrane extraction with a sorbent interface-micro gas chromatography system for field analysis", J CHROMAT A, 873(1), 2000, pp. 13-27

Abstract

The commercially available portable gas chromatographs have a rather limited scope of applications, typically allowing analysis of gaseous samples only, and having relatively poor sensitivity. Combination of those instruments with modern sampling/sample preparation techniques can remedy these problems. A Chrompack micro-CC system equipped with a thermal conductivity detector has been coupled to membrane extraction with a sorbent interface (MESI). The sorbent trap has replaced the GC injector. The design of the trap wasalso modified in order to enhance the preconcentration of analytes. The use of a thin flat sheet membrane reduces the response time, and decreases the memory effect of the system. Rapid separation times were achieved, and the sensitivity was significantly improved. MESI enables semi-continuous monitoring of both gaseous and aqueous samples, owing to the selectivity of themembrane material. The system does not use moving parts, therefore being reliable. The sensitivity of the micro-CC system was increased by a factor of more than 100 by the addition of the MESI system, even with a preconcentration time as short as 1 min. Chloroform, having a concentration lower than1 ppb, was detected in tap water. A cup system was used to allow headspacesampling of volatile organic compounds from aqueous matrices, keeping the membrane away from interfering species that could be present in water, and improving the mass transfer. A linear calibration line was obtained, and the estimated limit of detection was 60 ppt. This represents a great improvement for the sensitivity of the micro-CC system. (C) 2000 Elsevier Science B. V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 03:22:09