工作原理
ECD 使用置于氮气或氩气-甲烷载气/补偿气气流中的低水平 β 发射器,通常为 63Ni。从放射源发射出的电子与补偿气气体分子碰撞,产生更多自由电子,这些电子被加速冲向用变频恒流电压极化的阳极。当样品进入检测器时,亲电化合物捕获电子,阳极电压频率增加以保持电流恒定。分析物浓度与电子捕获程度成正比。
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微电子捕获检测器 (Micro ECD)
ECD 使用置于氮气或氩气-甲烷载气/补偿气气流中的低水平 β 发射器,通常为 63Ni。从放射源发射出的电子与补偿气气体分子碰撞,产生更多自由电子,这些电子被加速冲向用变频恒流电压极化的阳极。当样品进入检测器时,亲电化合物捕获电子,阳极电压频率增加以保持电流恒定。分析物浓度与电子捕获程度成正比。
This application note shows the analysis of halogenated hydrocarbons, and benzene and its derivatives in drinking water per GB/T 5750.8-2022 using the Agilent 8697 headspace sampler and Agilent 8890 GC.
Analysis of Flavor Compounds in Beer using 8697 headspace and 8890GC.
This document describes how to dispose of a used electron capture detector (ECD) when it is no longer needed or at the end of its operating life.
Highlights the features of and differences between GC detectors.
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