scholarly journals Review on stationary phases and coating methods of MEMs gas chromatography columns

2020 ◽  
Vol 39 (1) ◽  
pp. 247-259
Author(s):  
Liu Yang ◽  
Molin Qin ◽  
Junchao Yang ◽  
Genwei Zhang ◽  
Jiana Wei
Keyword(s):  
Gas Chromatography ◽  
Microelectromechanical Systems ◽  
Stationary Phases ◽  
Preparation Methods ◽  
Site Analysis ◽  
Advantages And Disadvantages ◽  
Coating Methods ◽  
On Line ◽  
Inorganic Adsorbents ◽  
Gas Chromatography Columns

Abstract Gas chromatography (GC) is an important and widely used technique for separation and analysis in the field of analytical chemistry. Micro gas chromatography has been developed in response to the requirement for on-line analysis and on-site analysis. At the core of micro gas chromatography, microelectromechanical systems (MEMs) have the advantages of small size and low power consumption. This article introduces the stationary phases of micro columns in recent years, including polymer, carbon materials, silica, gold nanoparticles, inorganic adsorbents and ionic liquids. Preparation techniques ranging from classical coating to unusual sputtering of stationary phases are reviewed. The advantages and disadvantages of different preparation methods are analyzed. The paper introduces the separation characteristics and application progress of MEMs columns and discusses possible developments.

Review of stationary phases for microelectromechanical systems in gas chromatography: feasibility and separations

2013 ◽  
Vol 406 (4) ◽  
pp. 981-994 ◽  
Author(s):  
I. Azzouz ◽  
J. Vial ◽  
D. Thiébaut ◽  
R. Haudebourg ◽  
K. Danaie ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Microelectromechanical Systems ◽  
Stationary Phases

scholarly journals Characterization of 9 Gas Chromatography Columns by Linear and Lee Retention Indices for Polychlorinated Biphenyls and Polychlorinated Naphthalenes

Separations ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 38
Author(s):  
Conner Stultz ◽  
Frank L. Dorman
Keyword(s):  
Gas Chromatography ◽  
Polychlorinated Biphenyls ◽  
Stationary Phases ◽  
Retention Indices ◽  
Polychlorinated Naphthalenes ◽  
Similar Chemical ◽  
Chromatography Columns ◽  
Column Selectivity ◽  
The Individual ◽  
Gas Chromatography Columns

Polychlorinated biphenyls (PCBs) and naphthalenes (PCNs) are ubiquitous environmental contaminants with varying degrees of toxicity. There are hundreds of possible congeners with similar chemical characteristics, which make these compounds difficult to isolate in environmental samples. Historically, PCBs and PCNs were identified by using an Aroclor or Halowax mixture instead of the individual compounds, which was impractical because of limited numbers of individual standards. A retention index database was developed with all 209 PCBs and 36 PCNs to help identify these chemicals in environmental and biological matrixes. This study uses linear and Lee retention indices to identify all 209 PCBs and 36 PCNs on nine gas chromatography columns. The most toxic congeners, the 12 dioxin-like PCBs, were compared across all columns to determine which stationary phases gave the best selectivity for those compounds. Column selectivity was also examined to determine columns for confirmatory analyses and GC×GC separations. The Rxi-17SilMS demonstrated the most drastic difference in PCB selectivity and, to a lesser extent, PCNs when compared with the other eight columns and could work as a confirmatory column or as a 2nd dimension column for GC×GC separations.

MEMS-based gas chromatography columns with nano-structured stationary phases

2008 ◽  
Author(s):  
Bassam Alfeeli ◽  
Syed Ali ◽  
Vaibhav Jain ◽  
Reza Montazami ◽  
James Heflin ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Stationary Phases ◽  
Chromatography Columns ◽  
Gas Chromatography Columns

Analysis of Aromatic Amines in Industrial Wastewater by Capillary Gas Chromatography-Mass Spectrometry

2000 ◽  
Vol 35 (2) ◽  
pp. 245-262 ◽  
Author(s):  
Francis I. Onuska ◽  
Ken A. Terry ◽  
R. James Maguire
Keyword(s):  
Gas Chromatography ◽  
Aromatic Amines ◽  
Methylene Chloride ◽  
Solid Phase ◽  
Stationary Phases ◽  
Gas Chromatography Mass Spectrometry ◽  
Substituted Anilines ◽  
Environmental Media ◽  
Solid Phase Extraction Cartridge ◽  
Wide Range

Abstract The analysis of aromatic amines, particularly benzidines, at trace levels in environmental media has been difficult because of the lack of suitable deactivated capillary column stationary phases for gas chromatography. This report describes the use of an improved type of column as well as a method for the analysis of anilines and benzidines in water, wastewater and sewage samples. Extraction procedures are applicable to a wide range of compounds that are effectively partitioned from an aqueous matrix into methylene chloride, or onto a solid-phase extraction cartridge. The extracted analytes are also amenable to separation on a capillary gas chromatographic column and transferable to the mass spectrometer. These contaminants are converted to their N-trifluoroacetyl derivatives. Aniline and some substituted anilines, and 3,3’-dichlorobenzidine and benzidine were determined in 24-h composite industrial water, wastewater, primary sludge and final effluent samples at concentrations from 0.03 up to 2760 µg/L.

Analysis of nonsteroidal anti-inflammatory drugs by using microfluidic techniques: a review

2020 ◽  
Vol 16 ◽  
Author(s):  
Chiara Fanali ◽  
Giovanni D’Orazio ◽  
Alessandra Gentili ◽  
Salvatore Fanali
Keyword(s):  
Stationary Phases ◽  
Low Flow ◽  
High Mass ◽  
Internal Diameter ◽  
Uv Detectors ◽  
On Line ◽  
Inflammatory Drugs ◽  
Anti Inflammatory ◽  
Silica Phases ◽  
Liquid Chromatographic

: In this review paper, miniaturized techniques, including both electromigration and liquid chromatographic ones, have been considered discussing their main features in the analytical field for the separation and analysis of nonsteroidal anti-inflammatory drugs (NSAIDs). In capillary electrophoresis (CE) and nano-liquid chromatography (nano-LC), separation are performed in capillaries with internal diameter (I.D.) lower than 100 m and therefore flow rates in the range 100- 1000 nL/min are applied. Therefore due to the low flow rate, high mass sensitivity can be obtained. Usually conventional UV detectors are used on-line; however these techniques can be coupled with mass spectrometry (MS). CE and nano-LC have been also applied to the separation of NSAIDs using silica stationary phases (SP) modified with C18 promoting interaction with analytes mainly based on hydrophobic interaction. In addition the use of chiral SP resulted effective for the chiral resolution of these compounds. In addition to silica phases, monolithic (both organic and inorganic) material has also been used. Although most of the presented studies aimed to demonstrate the usefulness of the considered microfluidic techniques, some applications to real samples have also been reported.

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