气相色谱柱、配件和吸附剂
气相色谱法(GC)是一种色谱技术,利用惰性载气(流动相)快速分离挥发性化合物。流动相推动气态化合物通过涂覆固相或液相固定相的加热色谱柱。该分离过程的基础在于气化化合物的化学物理性质差异及其与固定相的相互作用。
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相关资源
- Flyer: Gas Chromatography Guides and Resources
Essential Gas Chromatography Brochures: Navigate Your GC Workflow with Precision - Optimize Column Selection and Accessory Integration for Analytical Performance.
- Application Note: Rapid and Efficient Esterification Process for FAME Profiling of Vegetable Fixed Oils and Fats
The objective of this application note is to develop and validate a simple, safe, and complete altenative esterification method that is highly accurate, consistent, and capable of parallel processing for esterification of multiple vegetable oil and fat samples and also has applicability in quality control (QC) process.
- Guide: GC Columns for USP Compendial Methods
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- Article: SupraSolv® GC Solvent Specifications
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- Brochure: GC Workflow
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- Brochure: GC Columns Selection Guide
An optimized chromatographic separation begins with the column. The selection of the proper capillary column for any application should be based on four significant factors: stationary phase, column I.D., film thickness, and column length.
- Brochure: GC Solvents
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- Brochure: GC Accessories
Choosing the proper items for routine system maintenance and new column installation can save costly downtime and rework, plus help prevent inaccurate chromatographic results.
- Guide: Environmental & Agricultural GC Columns Selection Guide
We have developed the most extensive line of special purpose columns designed for industry specific applications. These columns are manufactured to deliver high resolution, great analyte response, low bleed, and long column life to achieve the analytical performance you require.
- Flyer: Determination of Benzene in Reformulated Gasoline
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.
- Application Note: GC-FID Method with Nitrogen as Carrier Gas for Simple-Routine Analysis of Essential Oils
The research examines nitrogen (N2) as an alternative to helium for GC-FID analysis of bergamot essential oil. By increasing nitrogen's velocity to 20 cm/s, analysis times comparable to helium were achieved, successfully quantifying 67 terpenes in 47 minutes with an optimized peak attribution model.
- Application Note: Hydrogen as Carrier Gas: A Reliable GC-MS Method for the Qualitative Analysis of Essential Oils
This research is focused on the development of a gas chromatography-mass spectrometry (GC-MS) method for the analysis of essential oils by using hydrogen (H2) as carrier gas.
- Brochure: Watercol™ Capillary GC Columns - Convenient Analysis of Water
Watercol™ 1910 is a specialized ionic liquid column designed for gas chromatography, particularly effective for moisture analysis.
气相色谱柱
更优的色谱分离始于适宜色谱柱的选择。气相色谱中主要有两种色谱柱:毛细管柱与填充柱。
填充式气相色谱柱
填充式气相色谱柱由不锈钢、聚四氟乙烯或玻璃管构成,内部填充填料(固定相)。此类色谱柱可处理较大样品体积且不易受污染。玻璃柱适用于要求高惰性的应用场景,金属柱适用于要求较低的应用场景,而聚四氟乙烯柱则更适合低温应用。
毛细管气相色谱柱
毛细管气相色谱柱最适用于高灵敏度检测。其结构为内壁经化学键合或涂层处理的熔融石英玻璃细管,固定相直接附着于管壁。
非极性气相色谱柱最适用于非极性化合物(如烷烃)的分析。Equity®-1、Petrocol®、SPB®-1、SPB®-Octyl及SLB®-5ms是分离非极性化合物的推荐产品。极性气相色谱柱在分离极性分析物时效率最高。 SPB®-624、OVI-G43、SPB®-20、Equity®-1701、SPB®-35、SPB®-50、SPB®-225、PAG、SPB®-1000、SLB®-IL60i及Nukol™等极性色谱柱可实现极性化合物的最佳分离。
高极性色谱柱包含具有较高氰丙基官能团含量的固定相。这些相展现出多种适用于极化化合物分离的相互作用。极化化合物是指含有C和H元素,但具有一个或多个C=C或C≡C键的化合物。 高极性毛细管色谱柱包括SP®-2330、SP®-2331、SP®-2380、SP®-2560、SP®-2340、TCEP、SLB®-IL111i。
气相色谱配件
适用于常见气相色谱仪的气相色谱配件包括气相色谱隔垫、进样口衬套、进样口密封件、套圈、螺母、保护柱、连接器、流量计、手动工具、注射器、瓶子和光离子化检测器 (PID) 灯。
气体净化与气体管理
气体输送系统必须根据预期用途,以适当压力提供高纯度的流动相气体。我们提供用于净化和管理气流(He、H、N、Ar)的产品,包括净化器、管道和调节产品、气体发生器以及空气压缩机。
碳基气相色谱吸附剂
我们提供高度工程化的碳吸附剂(Carbosieve®、Graphsphere™、Carbotrap®和Carbopack™)以及多种常用的分子筛和多孔聚合物吸附剂,用于气相色谱分析。我们的碳吸附剂具有以下关键特性:
- 坚硬且不易碎
- 高孔隙率
- 天然疏水性,适用于潮湿环境
- 适用于分析物分子量相对C2-C5正烷烃的样品
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