gc column Articles

  • Capillary GC Columns for Analysis of BTEX Hydrocarbons

    A number of different stationary phases have been used for analyzing benzene, toluene, ethylbenzene, and xylene hydrocarbons (the BTEX) compounds). Capillary columns based on a nonpolar shape-selective phase, a chiral stationary phase, and a polyalkylene glycol phase, and support coated open tubular columns (SCOT), exhibit differing abilities to resolve these compounds. A Bentone ...


    By Sigma-Aldrich Co., LLC

  • Environmental Applications Performed Using Equity Capillary GC columns

    Various Environmental Applications performed on the Supelco® Equity line of capillary GC columns; specifically the 100% poly(dimethylsiloxane) and poly(5% diphenyl.95% dimethylpolysiloxane) phases.  Applications include the following; USEPA Method 8270 for semivolatile compounds; USEPA Method 8081 for chlorinated pesticides; USEPA Method 8082 for polychlorinated biphenyls; diesel fuel; ...


    By Sigma-Aldrich Co., LLC

  • Analyze Trace Amounts of Solvents in Water Using Packed Column GC

    Glass or stainless steel columns containing 80/120 Carbopack B/3% SP-1500 packing can be used to analyze water-based samples for ppm to low percentage levels of many organic compounds. This bulletin describes minimum detection limits and maximum capacity of these columns, adsorption and memory effects, and other factors that affect component quantitation. Problems are defined that might arise ...


    By Sigma-Aldrich Co., LLC

  • The productive environmental laboratory: BSK Labs boosts efficiency with Metrohm IC

    BSK Labs runs a number of environmental laboratories and service centers along the west coast of the US. A total of 70 employees – including microbiologists, chemists, lab technicians, and support staff – make sure that the 200 to 350 samples that come in every week are analyzed. BSK Labs specializes in potable water chemistry, ground water monitoring, storm water runoff, solid waste ...


    By Metrohm AG

  • Two Detector Solution to Analyzing Sulfur

    Sulfur compounds are reactive, corrosive to pipes, and destructive to catalysts in petroleum refineries. Sulfur emission are strictly regulated globally. When released into the atmosphere sulfur dioxide converts to sulfuric acid resulting in adverse effects on human health and the environment. Sulfur detection is found useful in many other industries; therefore, detection of sulfur compounds in ...


    By Restek Corporation

  • Fast GC In Environmental Analysis

    Fast GC can be practical for many environmental analyses, and may not require a major investment in new equipment.  By applying the techniques of Fast GC such as, using shorter, narrower bore columns, faster oven temperature ramp rates, hydrogen carrier gas, and by taking advantage of the variety of column chemistries available in fast dimensions, analyses times can be significantly reduced ...


    By Sigma-Aldrich Co., LLC

  • GC Determination of Benzene in Reformulated Gasoline using a Supelco SLB-IL111 Ionic Liquid Column

    The amount of benzene in gasoline is a concern because it is a known human carcinogen, and exposure to it has been linked to detrimental health effects.  The challenge with the analysis lies in the complex composition of gasoline, which consists of hundreds of different compounds.  This application shows the separation of benzene and other gasoline compounds using a 60 m x 0.25 mm I.D., ...


    By Sigma-Aldrich Co., LLC

  • Monitor Sulfur Compounds in Petroleum Chemical, Environmental, and Other Samples, Using a Special-Purpose Capillary GC Column

    Measurement of sulfur compounds is important to petroleum chemical analysts for several reasons, including a need to monitor odor problems and prevent catalyst poisoning.  Quantification of sulfur compounds is also important to environment analysts and to food, beverage and fragrance analysts for similar reasons.  Analyses of sulfur compounds can be complicated by the inability to ...


    By Sigma-Aldrich Co., LLC

  • 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 ...


  • EPA Method 8270D Analysis Using Narrow-bore GC Columns and Fast Data Acquisition with a Quadrupole GCMS System

    Analytical support of environmental programs has been conducted for several decades using standard-bore capillary columns (0.25mmid) and quadrupole GCMS systems. Depending on method conditions and program requirements, the QC measures can consume a significant portion of a 12-hour shift, leaving less time for analysis of real-world samples. Typical cycle times (time from beginning of a run to the ...

  • 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 ...


    By Sigma-Aldrich Co., LLC

  • Analyses of Permanent Gases, Light Hydrocarbons, and Light Polar Compounds, Using Packed Column GC

    GC columns containing Carboxen-1000 packing separate mixtures of permanent gases (nitrogen, hydrogen, oxygen/argon, carbon monoxide, carbon dioxide) and C1-C3 light hydrocarbons (methane, acetylene, ethylene, ethane, propyne, propylene, and propane). A 15’ x 1/8” column will separate the permanent gases and C1 and C2 hydrocarbons in less than 25 minutes. A 2’ x 1/8” column ...


    By Sigma-Aldrich Co., LLC

  • 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 ...


    By Sigma-Aldrich Co., LLC

  • 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 ...


    By Sigma-Aldrich Co., LLC

  • Analysis of Natural Gas Products by GC / TCD / FID

    The complex mixture of condensible hydrocarbons and permanent gases in a natural gas product has historically been separated on gas chromatographs equipped with dual columns and a switching valve. The light gases are separated from heavier compounds on a molecular sieve column, which is then backflushed onto a suitable column to separating the rest of the mixture. The Buck Scientific Model 910 ...


    By Buck Scientific Inc

  • GC-MS Analysis of Polychlorinated Dibenzodioxins and Polychlorinated Dibenzofurans

    Polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) consist of 210 different compounds with varying degrees of toxicity, and the 17 congeners with chlorine substitution in the 2,3,7,8 positions are considered the most toxic. This chromatogram illustrates the separation of a 17 component 2,3,7,8-substituted PCDD and PCDF standard on a 30 m x 0.25 mm I.D. x 0.25 μm ...


    By Sigma-Aldrich Co., LLC

  • Enhanced separation of hop oils by flow-modulated GC×GC–TOF MS with Tandem Ionisation

    Beer contains hundreds of organic ingredients, with concentrations spanning many orders of magnitude, and including monoterpenes (C10) and sesquiterpenes (C15). These are aroma-active hydrocarbons found in the essential oils of various plants, including hops, and provide much of the characteristic ‘bitterness’ of the finished beer. Of the greatest importance for beer is the ...


    By SepSolve Analytical

  • Capillary GC Analyses of Chlorinated Pesticides in Dry Pet Food

    Based on federal and state regulations for identifying and quantifying low levels of pesticides in food and environmental samples, we selected three capillary columns to screen for chlorinated pesticides. A nonpolar and two low/intermediate polarity phases were chosen to evaluate differences  in component elution order and retention times. Low level screening analyses were performed ...


    By Sigma-Aldrich Co., LLC

  • Capillary GC Analyses of Triazine Pesticides in Dry Pet Food

    Based on federal and state regulations for identifying and quantifying low levels of pesticides in food and environmental samples, we selected three capillary columns to screen for triazine pesticides. A nonpolar and two low/intermediate polar phases were chosen to evaluate differences in component elution order and retention times. Low level screening analyses were performed effectively by using ...


    By Sigma-Aldrich Co., LLC

  • Detailed characterisation of essential oils by flow-modulated GC×GC and Tandem Ionisation mass spectrometry

    Volatile oils of plants, also known as essential oils, have been used for many years for their flavour, fragrance and medicinal properties. However, their extreme complexity and diversity presents analysts with a significant challenge when it comes to quality control. They are generally composed of monoterpenes and sesquiterpenes, as well as their oxygenated derivatives, such as aliphatic ...


    By SepSolve Analytical

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