capillary 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

  • 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 ...


    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

  • 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

  • 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

  • Resonant Column Tests on Partially Saturated Sands

    This paper describes the measurement of the influence of capillary effects on the dynamic shear modulus of partially saturated sands. A Hall-type resonant column apparatus was used to perform the experiments. The materials tested included natural angular and subrounded sands, angular and subrounded sands with specified artificial gradations, and uniform angular and subrounded sands with various ...


    By ASTM International

  • Monitor Organophosphorus Pesticides in Air, Using ORBO-49P Tubes and Capillary GC

    A sampling tube containing Supelpak-20 resin and a glass fiber filter effectively adsorbs and releases five organophosphorous pesticides (chlorpyrifos, diazinon, dichlorvos, malathion, parathion) in vapor or aerosol form in air.  At a sampling rate of 1L/min, 8 hour samples can be taken for all of these pesticides except malathion.  Short term (15 min) samples can be taken at the same ...


    By Sigma-Aldrich Co., LLC

  • Lower Detection Limits with Ground-Breaking Column Technology

    Rxi technology unifies outstanding inertness, low bleed, and high reproducibility into a single high performance column line. Take variation out of the equation and get the most consistent results for trace-level analysis with Rxi columns. phases available Rxi-1ms Rxi-1HT Rxi-5ms Rxi-5Sil MS Rxi-5HT Rxi-XLB ...


    By Restek Corporation

  • Water and vapor movement with condensation and evaporation in a sandy column

    The diffusion of warm, humid air into an initially cold, dry, sandy column was analyzed to study the movement of water vapor and liquid water under nonisothermal and low water content conditions. The analysis was performed using the HYDRUS-1D code. While the water retention curve of sand was measured experimentally, the unsaturated hydraulic conductivity function was inversely estimated from the ...

  • Removal of 2,4-dinitrophenol from wastewater by adsorption technology: a batch and column study

    Red mud, an aluminium industry waste, was converted into low cost adsorbent and for the dynamic uptake of 2,4-dinitrophenol, which was sorbed by the developed adsorbent up to 95%. The removal of this pollutant was achieved up to 96% by column experiments at the flow rate of 0.5 mL/minute. The adsorption was found to be endothermic in nature. The qualitative and quantitative estimation of the ...


    By Inderscience Publishers

  • Fast Screening for Chlorinated Pesticides, Using Solid Phase Microextraction (SPME) and Capillary GC

    Fast analysis of environmental samples increases throughput in the lab and is highly desirable for quick turnaround screening methods used in the field or prior to GC/MS analysis. Solid phase microextraction is a fast, solventless alternative to conventional sample extraction techniques. In SPME, analytes establish an equilibrium between the sample matrix and a stationary phase coated on a fused ...


    By Sigma-Aldrich Co., LLC

  • Prediction of three–phase saturation profiles from two–phase capillary pressure curves as a function of wettability

    Gravity drainage of oil with gas is an efficient recovery method in strongly water–wet reservoirs and yields very low residual oil saturations. However, many of the oil–producing reservoirs are not strongly water–wet. Thus, predicting the profiles and ultimate recovery for mixed and oil–wet media is essential to design and optimisation of improved recovery methods based on three–phase gravity ...


    By Inderscience Publishers

  • Monitor BTEX Compounds and Fuels in Water, Using Solid Phase Microextraction and Capillary GC

    BTEX compounds, kerosene, diesel fuel, or gasoline in water or aqueous suspensions of soil can be monitored by solid phase microextraction (SPME) and capillary GC on a short, narrow bore column (15mx 0.20mm ID).   A sample can be extracted and analyzed in less than 40 minutes.   Because no solvent is required, sensitive detection id scharacteristic of SPME/GC analyses.   ...


    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

  • 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 ...

  • 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

  • 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 ...


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