title: Conformationally blocked quinoxaline cavitand as solid-phase microextraction coating for the selective detection of BTEX in air.
abstract: A tetraquinoxaline cavitand functionalized with methylenoxy bridges at the upper rim is proposed as selective solid-phase microextraction (SPME) coating for the determination of BTEX at trace levels in air. The SPME fibers were characterized in terms of film thickness, morphology, thermal stability and extraction capabilities. An average coating thickness of 35 (±4) μm, a thermal stability up to 350 °C and a good fiber-to-fiber and batch-to-batch repeatability with RSD lower than 15% were obtained. Excellent enrichment factors ranging from 360-700 × 10(3) were obtained for the investigated compounds. Finally, method validation proved the capabilities of the developed coating for the selective sampling of BTEX, achieving LOD values in the 0.4-1.2 ng m(-3) range.
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Riboni
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
authors.forename: J W
authors.initials: JW
authors.lastname: Trzcinski
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy. Electronic address: federica.bianchi@unipr.it.
authors.forename: F
authors.initials: F
authors.lastname: Bianchi
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Massera
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Pinalli
authors.affiliation: Supelco, 595 North Harrison Road, Bellefonte, PA, 16823, USA.
authors.forename: L
authors.initials: L
authors.lastname: Sidisky
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy. Electronic address: enrico.dalcanale@unipr.it.
authors.forename: E
authors.initials: E
authors.lastname: Dalcanale
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Careri
keywords: Air monitoring; BTEX; Cavitands; Solid-phase microextraction