气相色谱柱、配件和吸附剂
气相色谱(GC)是一种使用惰性载气(流动相)快速分离挥发性化合物的色谱技术。流动相驱动气态化合物通过涂有固体或液体固定相的加热柱。汽化化合物化学和物理特性的差异以及它们与固定相之间的相互作用是分离过程的基础。
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相关资源
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气相色谱柱
改进色谱分离首先要选择合适的色谱柱。在气相色谱中,有两种类型的色谱柱:毛细管色谱柱和填料色谱柱。
填料气相色谱柱
填料气相色谱柱由不锈钢、聚四氟乙烯或玻璃管组成,管内填充填料(固定相)。填料柱可处理较大的样品量,且不易受污染。玻璃柱用于惰性要求高的应用,金属柱用于要求不高的应用,PTFE 柱则是低温应用的首选。
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。毛细管色谱柱由一个薄的熔融石英玻璃管组成,其中的固定相通过化学键合或涂布在色谱柱的内表面。
非极性气相色谱柱最适合分析非极性化合物(如烷烃)。Equity®-1、Petrocol®、SPB®-1、SPB®®-5ms 是用于分离非极性化合物的强力推荐产品。极性气相色谱柱分离极性分析物的效率最高。SPB®-624, OVI-G43, SPB®- 20, Equity®-1701, SPB®-35 SPB®-50, SPB-225、PAG、SPB®-1000、SLB®-IL60i 和 Nukol™ 是一些极性色谱柱,可提供最佳的极性化合物分离效果。
高极性色谱柱包括含有较高比例氰丙基官能团的固定相。这些固定相具有适合分离可极化化合物的各种相互作用。可极化化合物是指含有 C 和 H,但有一个或多个 C=C 或 C≡C 键的化合物。高极性毛细管柱包括 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器的气相色谱配件包括气相色谱隔板、入口衬垫、入口密封件、卡套、螺母、保护柱、连接器、流量计、手动工具、注射器、小瓶和光离子化检测器 (PID) 灯。
气体净化和气体管理
气体输送系统必须根据预期用途以合适的压力提供高纯度的流动相气体。我们提供净化和管理气流(He、H、N、Ar)的产品,包括净化器、管道和调节产品、气体发生器和空气压缩机。
碳气相色谱仪吸附剂
我们提供高度工程化的碳吸附剂(Carbosieve®, Graphsphere™、Carbotrap®,以及Carbopack™)和几种用于气相色谱分析的常用分子筛和多孔聚合物吸附剂。我们的碳吸附剂的主要特点包括
- 坚硬且不易碎裂
- 孔隙率高
- 具有疏水性,因此适用于潮湿环境
- 适用于分析物尺寸相对于 C2-C5 正构烷烃的分子
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