了解色谱法测定法

我们大多数人都使用注射器来将样品引入色谱仪的许多次，而无需了解其术语和规格。此类功能指定其组件部件，并有助于为所需的应用程序做出正确的选择。

让我们熟悉色谱中使用的注射器的命名和规格

终结

终结refer to the interface between the syringe barrel and its needle connection. The common terminations are described here:

胶合针（n）或固定针（f）

将针在与零刻度标记重合的点处粘合到玻璃注射器筒中。这种注射器不能高压灭菌。

Removable needle (RN)

The needle is removable to permit precise seating at the zero graduation mark. User has option to choose the needle gauge, length and point style. The syringe can be autoclaved upon dismantling.

滚花枢纽（kH）

用于高达6000 psi的高注射压力。提供了包含可重复深度注射的间隔物。拆除时可高压剥离。

PTFE鲁尔尖端（LT）

Needles are removable and fit over a ground glass hub which is tapered in the shape of a male luer. It is used to lock in place luer hub needles and connections. The syringe is autoclavable when disassembled.

Luer Tip Cemented Needle (LTN)

针对对应于零刻度标记的点，将针粘合到玻璃注射器筒中。死体积仅限于针的内部容积。这种注射器不是可高压剥离的。

PTFE Luer Lock

终端具有PTFE雄性Luer尖端，带有镀镍黄铜锁定轮毂，接受并锁定到适用于金属针和通用连接器。拆除时可高压剥离

样品锁（SL）

样品锁定与RN的ON / OFF valvel合并。针。终止用于网上空间分析，环境样品收集和储存，GC样品的预冲压水解GC analysis. Not autoclavable.

点样式

Point style selection helps in particular application.

Points style 2 :锋利的针头，用于最佳隔膜渗透和最小隔膜

Point style 3 :blunt needle point for HPLC injection valves and for sample pipetting

Point style 5 :hole/bevel needle with side hole. Liquid samples are filled and dispensed through the side hole. Less coring damage of septa

点样式AAS：特殊的锥形针尖，用于自动采样器注射器。

Optimum use of point styles in different applications

GC注射 -点样式AAS延伸了Secta的使用寿命。交替的点样式2也是常用的。

HPLC.injections-22仪表，点样式3针常用

针仪

Different size gauges are available for syringe needles ranging from 22 to 26 and 22S to 26S. Small s specifies a small internal volume of the needle. Needles with small s have thicker sidewalls which is a useful feature when using the syringe in the autosampler

测量	o.d (mm)	i.d (mm)
22.	0..72	0.41
22s.	0..72	0.15
23.	0.64	0.34
23s.	0.64	0.15
25.	0.51	0.26
26.	0.46	0.26
26s.	0.47	0.13

The next article will provide useful tips on proper use, handling and care of syringes for long time usage and accuracy of results