HPLC - 哪些模块需要定期校准?

HPLC  - 哪些模块需要定期校准?
HPLC.-module-3
手动注射HPLC系统

HPLC.在第一个外观上似乎是一个复杂的系统,包括模块化盒和一个复杂的一束管,而在现代系统中,大多数管子都隐藏在模块内。如果您仔细看看模块的谜团将开始展开,并且您将能够将它们解析为每个具有定义角色的简单功能单元

  • 流动阶段 - 作为样品的载波流
  • 注射器 - 将固定体积的样品注入到移动相流中
  • Pump – delivers mobile phase at constant flow rate
  • Column– separates the sample components
  • 柱烤箱 - 保持恒定的柱温
  • Detector – detects individual eluting sample components

并非所有组件部件都需要定期校准,并且只有仔细的处理就足够了。这些部分的例子是:

流动阶段 -流动阶段需要新建准备,它应该没有悬浮物质。始终采用相同的混合过程来消除由于混合热引起的误差

Columns –列是HPLC系统最关键的组件。如果没有很好地保持一列,它会失去其分离效率。使用工作标准你应该建立那个系统适用性参数仍然在规定的限度范围内。如果在指定限制之外的偏差情况下,应更换列

Modules requiring regular calibration

A pump comprises of several parts that are precisely designed to deliver consistent flow rates. However, due to regular usage wear and tear results in flow rate deviations. Timely replacement of worn out parts improves the precision of flow delivery but still regular calibration is necessary. Pump calibration involves establishing flow rate accuracy and gradient composition accuracy.

Sample Injectors

手动注射需要使用样品填充固定音量环。需要用移动相重复刷新循环,从而消除了较早的样本的痕迹。在进行样本分析之前等待基线稳定稳定。自动喷射器被制造成每次允许充分的洗涤循环以确保清洁注射,以便递送精确的体积。喷射器校准涉及确认注射器精度,精确,线性度和携带测试

炉箱

化合物的保留次数取决于流动相粘度,又是温度依赖性的。应在规定的温度范围内保持该柱以获得保留时间的一致性。有必要从时间校准柱式烤箱的温度再现性。

Detector

A detector gives absorbance signals that are dependent on wavelength of absorption by the sample components. The absorption signals can drop due to lamp life, residual impurities or other contributing factors. Timely replacement of lamps and regular cleaning of detector eliminates such problems but detector requires regular calibration using specified reference compounds which are injected into the mobile phase stream. The two main parameters requiring calibration are linearity of response and wavelength accuracy

HPLC是一种流行的分析技术,有几种知名度可供选择。您必须以建议的时间间隔采用制造商规定的校准程序,以获得所需的准确性和结果精度。

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