Rapid separation of elemental species by multicapillary GC

Rosenkranz, Bernd; Bettmer, Jörg

doi:10.1007/s00216-002-1331-x

Cited by 14 publications

(3 citation statements)

References 8 publications

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“…Next, similar calculations have been made for methylmercury for our experimental setup, and the respective data were 270 and 0.18 mm. A similar HETP value has been obtained by Rosenkranz et al [3] for diethylmercury (0.17 mm) under similar conditions but for 1 m-long MCGC column.…”

Section: Separation and Multichannel Detectionsupporting

confidence: 88%

“…Both classes of compounds have been found mainly in aquatic environments as result of human activity (butyltin compounds) and as a consequence of natural biomethylation of inorganic mercury. MCGC columns in combination with MIP-OES detection have been proposed as more selective and sensitive substitution of classic GC [1][2][3]. Numerous analytical methods have been described in the literature to measure mercury and tin organic species in samples of various origin [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Rapid Separation of Elemental Species by Fast Multicapillary Gas Chromatography with Multichannel Optical Spectrometry Detection following Headspace Solid Phase Microextraction

2015

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Abstract:A method for conducting fast and efficient gas chromatography based on short multicapillaries in straight alignment combined with atomic emission detection was developed for field analysis. The strategy enables for speciation analysis of organometallic compounds. The analytes are simultaneously ethylated and preconcentrated on a solid phase microextraction (SPME) fiber placed in the headspace over the sample for 25 min. The ethylated species are then completely separated and selectively quantified within 25 s under isothermal conditions. A new miniaturized speciation analyzer has been constructed and evaluated. The system consists of a GC injection port and a lab-made miniaturized GC unit directly coupled with miniaturized plasma excitation source. The emitted light is transferred via optical fiber and registered with a miniaturized charged coupled device (CCD) based spectrometer. Working parameters for multicapillary column gas chromatography with atomic emission detector, including carrier gas flow rate, desorption temperature, and GC column temperature, were optimized to achieve good separation of analytes. Basic investigations of the fundamental properties of 5 cm-long multicapillary column, to evaluate its potential and limitations as a rapid separation unit, are presented. The adaptation of the technique for use with a SPME system and with a multichannel element-selective plasmaemission detector is highlighted.

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Section: Separation and Multichannel Detectionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Rapid Separation of Elemental Species by Fast Multicapillary Gas Chromatography with Multichannel Optical Spectrometry Detection following Headspace Solid Phase Microextraction

2015

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“…Both 1-m-long micro-single-capillary columns (μSCC) and 25-cm-long micro-multicapillary columns (μMCC) can be coated with ease. It is important to note that μMCC with very narrow widths and parallel channels provide high sample capacity, high separation efficiencies, and rapid analysis times. , Moreover, with the relatively simple concept and straightforward process, LbL assembly could be conveniently incorporated into the parallel manufacturing of silicon-based μGC devices.…”

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confidence: 99%

Highly Stable Surface Functionalization of Microgas Chromatography Columns Using Layer-by-Layer Self-Assembly of Silica Nanoparticles

et al. 2013

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A controllable and high-yield surface functionalization of silicon microchannels using layer-by-layer (LbL) self-assembly of SiO 2 nanoparticles (SNPs) is presented. The application of SNPs (45 nm average diameter) coating as a stationary phase for chromatographic separation is also demonstrated with surface functionalization using chloroalkylsilanes. This method facilitates a simple, low-cost, and parallel processing scheme that also provides homogeneous and stable nanoparticle-based stationary phases with ease of control over the coating thickness. The SNP-functionalized microfabricated columns with either single capillary channels (1 m long, 150 μm wide, 240 μm deep) or very narrow multicapillary channels (25 cm long, 30 μm wide, 240 μm deep, 16 parallel channels) successfully separated a multicomponent gas mixture with a wide range of boiling points with high reproducibility. B ecause of recent advancements and the emergence of microelectromechanical systems (MEMS), energy-efficient integrated microgas chromatography (μGC) systems have attracted considerable attention. This system, upon complete realization, could expand the range of applications for real-time and rapid on-site analysis at a lower cost.1−10 As a key component in μGC systems, conventional meters-long separation columns are necessarily replaced with microfabricated silicon columns on the order of a few square centimeters. The separation ability and efficiency of the columns are directly related to the quality of the stationary phase. Using conventional coating techniques on microfabricated columns (e.g., dynamic or static coatings of functionalized polysiloxane polymers), especially for highaspect-ratio (HAR) rectangular-shaped capillary channels, present major challenges toward obtaining stable, reproducible, and uniform coatings. 11There have been progressive research efforts toward the development of coating techniques that yield chemically inert, thermally stable, selective, and robust stationary phases. Specifically, nanotechnology-based phases have opened up countless prospects for applications in conventional as well as microfabricated separation columns with nanoscale controllability, simplicity, and flexibility.12,13 Recently, carbon nanotubes 14,15 and thiol-encapsulated gold nanoparticles 16 have been utilized for gas chromatography (GC) separations. Our group has reported on the capability of thiol monolayers on electrodeposited gold surfaces as a stationary phase for microfabricated columns by combining nanofabrication and microfabrication techniques. 17,18The excellent adsorption properties of silica for organics has long been demonstrated as a stationary phase medium for conventional columns (silica gel, Celite) 19 and, more recently, by employing the MEMS-compatible sputtering technique for microfabricated columns.20 SiO 2 nanoparticles (SNPs), because of their small and uniform size, high surface area, chemical inertness, and thermal stability, are excellent candidates for stationary phases. SNPs have also been dispe...

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Elemental Trace Analysis in Studies of Food Products

Grembecka

Szefer

2016

Handbook of Trace Analysis

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Rapid separation of elemental species by multicapillary GC

Cited by 14 publications

References 8 publications

Rapid Separation of Elemental Species by Fast Multicapillary Gas Chromatography with Multichannel Optical Spectrometry Detection following Headspace Solid Phase Microextraction

Rapid Separation of Elemental Species by Fast Multicapillary Gas Chromatography with Multichannel Optical Spectrometry Detection following Headspace Solid Phase Microextraction

Highly Stable Surface Functionalization of Microgas Chromatography Columns Using Layer-by-Layer Self-Assembly of Silica Nanoparticles

Elemental Trace Analysis in Studies of Food Products

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