Gas Chromatography Column Articles on Environmental XPRT

High Resolution Detailed Hydrocarbon Analyses by Capillary Column Gas Chromatography

In the petrochemical industry, samples such as petroleum naphthas and gasolines routinely must be quantitatively separated into their individual components. Because these petroleum-derived samples consist of hundreds of compounds, petroleum analysts require chromatography columns that offer high resolution. We have developed polar and nonpolar capillary gas chromatography columns to ...

Dec. 31, 1994

By MilliporeSigma

Chromatography Tips

No.1 Gas Chromatography Tips Our Founders and engineers of the company had accumulated more than 60 years experience in the research and development of HPLC instrumentation; HPLC column technology; mass spectrometer installation, training and services; chemical and biochemical separation, detection and quantification, Proteomics and cancer biomarker research and ...

Oct. 25, 2011

By AcuTech Scientific Inc.

New developments in chromatography

Welcome to Chromatography News from Varian, Inc., our newsletter dedicated to letting you know what’s new in Chromatography and how it can help you achieve the best results in your analysis, in the fastest and most cost-effective way. This issue focuses on Varian’s high quality, stable, FactorFourTM (VF) capillary gas chromatography columns for the best results in GC. In response to demand from ...

Jul. 18, 2008

Knotted in-tube and mini-column solid phase extraction of polycyclic aromatic compounds and nitroaromatics from aqueous samples for their determination by gas chromatography–mass spectrometry

The selectivity of in-tube extraction by PTFE tubing vis-a-vis mini-column SPE has been evaluated for preconcentration and cleanup of PACs in their natural matrix, and has been found to effectively remove many polar analytes such as nitrogen containing aromatic heterocyclic compounds, anilines, phenols and certain organophosphorus pesticides. Knitting of tubings created a secondary flow pattern ...

Jul. 25, 2006

By Inderscience Publishers

Low thermal mass gas chromatography – Analysis at MACH speed

Gas Chromatography (GC and GC/MS) analysis has been the mainstay for the analysis of regulated organic contaminates in the environmental field. Numerous advancements have occurred in GC instrumentation that include improvements for injectors, detectors, automation, software, and GC column choices. Although many advancements have been made in GC technology, very little has changed for column oven ...

Oct. 17, 2007

Headspace gas chromatography with flame ionization detection (HS-GC-FID) for the determination of dissolved methane in wastewater

There is currently a need for a simple, accurate and reproducible method that quantifies the amount of dissolved methane in wastewater in order to realize the potential methane that can be recovered and account for any emissions. This paper presents such a method, using gas chromatography with flame ionization detection fitted with a GS-Gas PRO column coupled with a headspace auto sampler. A ...

Sep. 17, 2014

By IWA Publishing

Chromatography plays its part in turning Science Fiction into Science Fact

Tomek Bagiński’s short film Ambition picks up on a fundamental drive of human kind, a thirst for knowledge and understanding, a thirst that can be sated through projects like Rosetta which are turning science fiction into science fact: Ambition the film Rosetta is an ESA mission with contributions ...

Nov. 3, 2014

By Anthias Consulting Ltd.

Application of gas chromatography-mass spectrometry preceded by solvent extraction to determine volatile fatty acids in wastewater of municipal, animal farm and landfill origin

This study describes extraction of selected volatile fatty acids (VFAs) (containing from 2 up to 8 carbon atoms) with methyl-tert-butyl ether (MTBE) from polluted aqueous samples followed by separation, identification and quantification by gas chromatography coupled with mass spectrometry (GC-MS). Extraction parameters such as time and number of extractions, volume ratio, effect of acidification ...

Feb. 1, 2011

By IWA Publishing

Evaluations of Polar and Highly Polar Ionic Liquid Capillary GC Columns with Environmental Samples

Ionic liquids are a class of non-molecular ionic solvents with low melting points. These liquids are unique combinations of cations and anions and can provide a variety of different selectivities when used as stationary phases in capillary gas chromatography. A number of ionic liquid phases have been evaluated and characterized for selectivity and determined to be polar or highly ...

Sep. 16, 2010

By MilliporeSigma

Target GC-MS Analysis using Accelerated Column Heating and Interactive Deconvolution Software

In diverse fields ranging from environmental samples to complex fl avor preparations, high performance, high resolution capillary gas chromatography/mass spectrometry, GC-MS, has become the preferred technique for identifying and quantifying target compounds at trace levels. Many of these samples are characterized by very complex matrices, which provide a substantial challenge for contemporary ...

Nov. 1, 2007

Natural Gas: Complete Analytical Solution

Chromatotec® has developed in its Research & Development laboratories, a new instrument for hydrocarbon (C1-C6+) measurements and calorific values as well as WOBBE index computation. This analyzer is based on chromatography principle using a Thermal Conductivity Detector (TCD). The sample will be separated into the column and quantified by the detector. A difference of thermal ...

May 1, 2014

By Chromatotec Group

Analysis of Polychlorinated Biphenyls in Fish Oil Using Supelclean EZ-POP NP, Silica Gel SPE, and an SLB-5ms GC Column

Polychlorinated biphenyls (PCBs) were once widely used in many industrial and commercial applications such as insulating fluids, dielectrics, and lubricants. This included their extensive use in electrical transformers. PCB use has been banned in many countries, and the Stockholm Convention currently prohibits their production and use ...

Sep. 4, 2015

By MilliporeSigma

GC Analyses of Polynuclear Aromatic Hydrocarbons

Polynuclear aromatic hydrocarbons (PAHs) can be separated by packed column or capillary column gas chromatography. An SPB-5 bonded phase fused silica capillary column separates the 16 PAHs considered priority pollutants in wastewater by the US Pal SP-301, a liquid crystal stationary phase in packed GC columns, resolves benzo(e)pyrene and benzo(a)pyrene. This publication discusses ...

Dec. 31, 1996

By MilliporeSigma

SLB-IL111 for Petroleum Applications

Gas chromatography (GC) is commonly employed for many applications in the petroleum industry. Two specific applications, the determination of benzene and other aromatics in gasoline, and the fatty acid methyl ester (FAME) profile of B20 biodiesel, present special challenges and require the use of a highly polar column. The SLB™-IL111 column utilizes a stationary phase with extreme polarity ...

Jan. 12, 2012

By MilliporeSigma

The environmental aspects of the evaporation of BTEX from gasoline with and without ethanol

In this work the vapours from two columns simulating gasoline–contaminated soils (with and without ethanol) were monitored. Standards mixtures of BTEX, containing different ethanol contents were also analysed. The instrumental analysis was performed by Gas Chromatography with a Flame Ionisation Detector. Among BTEX, except benzene, in both columns the evaporation rate increases with time. In the ...

Feb. 4, 2013

By Inderscience Publishers

Rapid HPLC Analysis of PAH Compounds, Using Porous 3µm Particles

Polynuclear aromatic hydrocarbons (PAHs) are a severe environmental hazard with a variety of sources. Airborne particles, combustion products, and fossil fuels all contain these toxic aromatic substances. Analysis by gas chromatography (GC) has been problematic because GC phases do not meet the need for shape selectivity in separating PAHs. Conversely, high-density C18 octadecylsilane (ODS) ...

Dec. 31, 1997

By MilliporeSigma

Validation of USEPA Method 524.2 Using a Stratum PTC, AQUATek 100 Autosampler, and Perkin-Elmer Clarus 600 GC/MS

The US EPA developed Method 524.2¹, “Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry”, for identifying and measuring purgeable volatile organic compounds (VOC) in surface water, groundwater, and drinking water. Due to the required sensitivity of this method, the use of purge and trap gas chromatography is vital. This ...

Apr. 11, 2010

By Teledyne Tekmar

Identification of organonitrogen compounds from thermally dissolved Huolinguole lignite in ethanol

Thermal dissolution of Huolinguole lignite (HL) in ethanol was conducted at 330°C for 2 h. The soluble fraction was sequentially eluted with petroleum ether (PE), ethyl acetate (EA)/PE mixed solvents with increased EA to PE ratio, and EA to afford five eluted fractions (EF 1 -EF 5 ) through a silica gel-packed column. In total, 49 organonitrogen compounds (ONCs), including ...

Aug. 26, 2014

By Inderscience Publishers

Determining pesticides in dietary supplements with QuEChERS extraction, cartridge SPE, and GCxGC-TOFMS

Regulatory requirements are driving the development of new multiresidue pesticide methods for dietary supplements. Minimizing matrix interference is critical for data accuracy. The novel approach employed here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS analysis, and results in good recoveries across a range of compounds found in these complex matrices. ...

May 24, 2012

By Restek Corporation

Analysis of Organophosphorus and Organonitrogen herbicides in water using GC/MS with selected ion recording

Laboratories monitoring trace level pesticides and herbicides by gas chromatography/mass spectrometry (GC/MS) frequently utilize Selected Ion Recording (SIR) techniques to maximize analytical sensitivity for quantification. With analytical standards, precision is limited to a large extent only by the autosampler and other instrumental effects. However, real-world samples pose a greater challenge. ...

Oct. 28, 2011

By PerkinElmer, Inc.

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