When analyzing hydrocarbon impurities in propylene by ASTM D2712, using an Rt-Alumina BOND Na2SO4 PLOT column instead of a packed column setup provides the greatest degree of resolution in the least amount of time. (PDF - 0kB)
Restek’s Rtx-Volatile Amine column is specifically designed for GC analysis of volatile amines in challenging matrices. The stable bonded phase is highly retentive and selective for volatile amines to ensure good chromatographic separations and peak shapes. In addition, the column is very robust and able to withstand repeated exposure to harsh sample matrices, such as water.
Following ASTM D6584-17, glycerin and glycerides in biodiesel oil were analyzed on an Rtx-Biodiesel TG column fitted with a retention gap. Results met or exceeded method criteria, and the retention gap improved analyte focusing and extended column lifetime.
バイオディーゼル中のグリセリンとグリセライドの分析では、オーブン温度を恒温にする必要があります。このためカラム寿命が短くなり、装置のダウンタイムが長くなります。MXT-Biodiesel TGカラムは金属カラムでフューズドシリカカラムよりも耐久性に優れており、装置のダウンタイムを最小限に抑えるのに最適です。MXT-Biodiesel TGカラムはEN 14105 (2011)の性能要件を満たし、バイオディーゼル分析に適した結果を提供します。
Volatile amines, such as monomethylamine, diethylamine, and triethylamine, are widely used in the petrochemical industry, but are prone to poor peak shape and difficult to analyze. Low levels of volatile amines can now be accurately reported using new Rtx-Volatile Amine columns due to high column inertness.
Carrier gas changes for SimDist methods, such as ASTM Method D7213, can be easily implemented in your daily process. Using MXT-1HT SimDist columns and EZGC method translation software, helium-based SimDist methods can be easily translated to alternative carrier gases while maintaining ASTM Method D7213 requirements.
Accurate analysis of biodiesel FAME in jet fuel is critical for ensuring that contamination levels do not exceed allowable limits. Method IP 585 is commonly used for this analysis and here we perform the method using a Stabilwax column and GC-MS in SIM mode. Method calibration curve criteria were met and good recoveries of the total FAME content in jet fuel were obtained.
EN 14103 (2011)法によるB100バイオディーゼル最終製品中の脂肪酸メチルエステル類(FAMEs)分析用に，極性カラムを評価しました。Restek Pro EZGC クロマトグラムモデラーを使用して，シアノ基の含有量が高いRt-2330カラムとポリエチレングリコール相のFAMEWAXカラムを比較しました。 Pro EZGCはRT-2330を使用した場合FAME (18:2)と内部標準(19:0 FAME)の共溶出が避けられないことを予測しました。しかし， Pro EZGC はまた，FAMEWAXカラムなら対象となるすべての化合物を分離することを予測しており，実験で証明されました。加えてFAMEWAXでは全FAMEとリノレン酸メチルエステル成分のどちらも優れた再現性を示しました。
When testing for impurities in ethylene using ASTM D6159-97, the combination of an Rt-Alumina BOND column coupled to an Rtx-1 column provides the best resolution of the most common hydrocarbon contaminants. (PDF - 0kB)
Analysis of Trace Hydrocarbon Impurities in 1,3-Butadiene Using Optimized Rt-Alumina BOND/MAPD PLOT Columns
Impurity analysis of 1,3-butadiene on an Rt-Alumina BOND/MAPD column results in good separation of both light polar impurities (methyl acetylene, propadiene) and 4-vinylcyclohexene, a heavier contaminant that often requires testing on a second column.
In process GC analyses, this material offers unique selectivity for the difficult-to-separate saturated and unsaturated C4 hydrocarbons, eluting cis-2-butene before
Analyze ppb Level Sulfur Compounds Using an Rt-XLSulfur Micropacked GC Column or an Rtx-1 Thick Film Capillary
Analyze Trace Polar Hydrocarbons More Accurately and Reliably With New Alumina BOND/MAPD PLOT Columns!
Rt- and MXT-Alumina BOND/MAPD PLOT columns outperform other MAPD columns for trace analysis of methyl acetylene, acetylene, propadiene, and other polar hydrocarbons. The new deactivation results in more predictable responses, increased capacity, and higher temperature stability. (PDF - 0kB)
Two methods are used to quantify individual alcohols and ethers in gasoline: a single column OFID method (e.g., ASTM Method D5599-94) and dual-column ASTM Method D4815-93. Restek offers columns, calibration mixtures, and inert capillary tubing for both approaches. 4-page note. (PDF - 0kB)
Restek は統合石油化学ソリューションの理想的なパートナーであり、当社のASTM法製品ガイドでSimDist、 DHA、ガソリン、その他の一般的な石油分析用の正しいGCカラムと標準スタンダードの素早い選択に役立ちます。
The current helium shortage has severely impacted gas chromatographers who are finding that helium has become significantly more expensive and is not always available when needed. This article explores the benefits and considerations of replacing helium with hydrogen carrier gas.
This flyer includes data demonstrating the performance of recommended GC columns for the analysis of total glycerin, fatty acid methyl esters (FAMEs), and residual methanol in biodiesel. Features a comparison of metal and fused silica columns. (PDF - 1285kB)
Rtx-DHA columns are ideal for Detailed Hydrocarbon Analaysis (DHA) methods and easily meet or exceed both ASTM D6730-01 and Canadian General Standards Board CAN/CGSB 3.0 No. 14.3-99 requirements. Every Rtx-DHA column is tested for retention, efficiency, stationary phase selectivity, and bleed—guaranteeing reproducible column-to-column performance. (PDF - 3989kB)
新しいDiatoSorb-W珪藻土は、供給制限をおこなっているわけではありませんが、Restekからのみ入手可能です。この新しい珪藻土は、充填カラムユーザーにとって信頼性の高い代替品です。 供給不足と不安定な品質が続いていましたが、従来の珪藻土カラムユーザーに新しい珪藻土供給源をもたらすことができました。 レステックは現在、Silcoport W パックドカラムや標準的に使用してきた珪藻土の独占的な代替品としてDiatoSorb-Wを使用しています。 全てのDiatoSorb-Wの原材料は、高純度で信頼できる性能を保証するために厳格な品質試験を受けます。 DiatoSorb-Wには、酸洗浄（WAW）、非酸洗浄（WNAW）および高性能（WHP）タイプがあります。
Using metal columns to analyze glycerides in biodiesel offer significant performance advantages compared to fused silica columns, as shown in this evaluation.
New metal MXT PLOT columns offer greater stability than conventional PLOT columns, making them a better choice for process GC analyzer applications. New bonding techniques result in highly reproducible flow characteristics, improved layer stability, and excellent separation efficiencies.
Robust Rtx-DHA columns are highly stable and can be run with hydrogen carrier gas under accelerated conditions. The hydrogen-based method for detailed hydrocarbon analysis shown here is twice as fast as traditional approaches, which allows labs to process samples faster and make more profitable decisions during product blending.
Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography
Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used to analyze petroleum biomarkers creating unique fingerprints of crude oil samples and tarballs collected after the Deepwater Horizon oil spill.
Ultra-low bleed and exceptional inertness assure complete separation of sulfur compounds (hydrogen sulfide, carbonyl sulfide, dimethyl sulfide, mercaptans) on our new column, with excellent peak shapes and reliable quantification at ppbv levels. A Sulfinert treated sampling/transfer system assures no adsorption losses of these very reactive compounds.
Comprehensive 2D GC, also known as GCxGC, is a powerful technique with a great deal of potential for improving separations of complex petroleum and petrochemical samples that contain hundreds—or even thousands—of components. While GCxGC is still considered emerging technology and is used primarily in research and development labs, it has undergone significant growth in the past few years.
The high temperatures required for biodiesel analysis by gas chromatography present a considerable challenge to analytical columns. Fused silica columns, even those rated for high-temperature tolerance, breakdown relatively quickly. Restek’s new MXT-Biodiesel columns are more stable up to 430°C and offer excellent chromatography for glycerides. These columns are available in two configurations: factory-coupled to a 0.53mm retention gap, or with a built-in, leak-proof Integra-Gap retention gap.
Improve Trace Analysis of Acetylene, Propadiene, and Methyl Acetylene Impurities With Higher Sample Capacity Alumina MAPD Columns
Rt-Alumina BOND/MAPD columns offer higher capacity than other MAPD columns and are ideal for analyzing acetylene, propadiene, and methyl acetylene in petroleum gases. Greater capacity improves data accuracy due to better peak symmetry and a wide linear range.
Rt-Alumina BOND/CFC columns provide high retention and high selectivity for volatile halogenated hydrocarbons, without the activity that is usually observed with alumina adsorbents. Chlorofluorocarbon analysis, in particular, can benefit from this new technology.
Restek's new D3606 column set outperforms TCEP columns for gasoline testing. The D3606 set has higher thermal stability and reliably resolves benzene from ethanol, resulting in more accurate quantitation.
Relative to helium as the GC carrier gas, hydrogen from a gas generator reduces gas costs, cuts analysis time by 50%, and reduces temperatures needed for eluting analytes which increases column lifetime. Parker ChromGas hydrogen generators are safe, convenient, reliable, and easy to use.
This 2-column set for modified ASTM Method D3606-10 completely resolves benzene from ethanol in reformulated fuels containing ethanol. The aromatic compounds also are fully separated and can easily be quantified using sec-butanol as an internal standard. (PDF - 0kB)
Restek's porous layer open tubular (PLOT) columns feature an innovative bonding process that minimizes particle release for more consistent flow, stable retention times, outstanding peak symmetry, and improved impurity analysis. Restek PLOT columns are the benchmark for performance. (PDF - 3255kB)
Rt-XLSulfur Packed GC Column for Analysis of Low-Level Sulfur Compounds in C1-C6 Hydrocarbon Streams
Rt-XLSulfur columns resolve hydrocarbons from sulfur compounds in hydrocarbon process streams and exhibit excellent inertness with low ppbv levels of sulfurs.
A Restek PLOT column can be your best solution for difficult separations of gaseous analytes. Rt-Msieve 5A PLOT columns offer fast, efficient separation of argon/oxygen, hydrogen/helium, and other permanent gases, including permanent gases in refinery or natural gas. You can make difficult separations without subambient temperatures, e.g.: separate oxygen from argon to baseline in approximately 4 minutes.
ShinCarbon ST Micropacked GC Columns: Above-Ambient Analyses of Permanent Gases and Light Hydrocarbons
A ShinCarbon ST micropacked column will separate hydrogen, oxygen, nitrogen, carbon dioxide, carbon monoxide, and methane in 10 minutes, without cryogenic cooling. This 2-page note also shows separations of light hydrocarbon/permanent gas mixtures, natural gas components, and fluorocarbons. (PDF - 0kB)
Restek offers an expansive line of Sulfinert-treated sample cylinders, valves, and accessories. (PDF - 0kB)
Refinery and natural gas samples often contain trace amounts of sulfur- and mercury-containing compounds, which can interfere with reactions, poison catalysts in petrochemical processes, and damage equipment. Because these compounds quickly react with stainless steel surfaces, accurate determination of these compounds is impossible when samples are collected and stored in untreated sample cylinders. Restek's Siltek and Sulfinert passivation techniques bond an inert layer into the surface of stainless steel, preventing active compounds from reacting with or adsorbing to the steel.
Recovery of a 17ppbv test standard of hydrogen sulfide exceeded 85% after 54 hours in a Sulfinert-treated cylinder; recoveries of methyl mercaptan, ethyl mercaptan, carbonyl sulfide, and dimethyl disulfide exceeded 90%. A Sulfinert-treated sampling/transfer system can assure accurate sulfur content data for natural gas, beverage-grade carbon dioxide, or other samples.
The results of a simulated distillation analysis are vitally important to the operation of refineries globally. For the analysis of petroleum samples within the boiling point range from 55.5 ˚C to 538 ˚C, ASTM D2887 is a standard method that has been accepted and is used industry-wide. This application note will demonstrate how a creative use of the Restek GC Accelerator oven insert kit can permit analysts using Agilent 6890/7890 GCs with 100/120 V ovens to successfully migrate from D2887’s slower Procedure A conditions to the accelerated Procedure B conditions without new instrumentation or software, resulting in a 9-minute analysis time that meets all method requirements.
ASTM Method D2887 now allows for alternate carrier gases, so hydrogen or nitrogen can replace helium carrier gas for simulated distillation. Here, we show that with an MXT-1HT SimDist column and Restek’s EZGC online method translator existing methods using helium can be easily converted to either hydrogen or nitrogen carrier gas. Because retention times are preserved with proper method translation, there are minimal changes to peak identification tables which significantly simplifies method validation.
Most analysts still use traditional packed columns for light hydrocarbon analysis, but many adsorbents are also available in micropacked column formats. Micropacked columns are a good alternative when both efficiency and sample loadability are desired.