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气相色谱法

气相色谱法. Gas chromatography GC. 火焰离子化检测器 FID. 电子捕获检测器 ( electron capturedetector,ECD ) 利用辐射源产生的放射线使载气分子离子化,形成稳定的基流,组分流出色谱柱后,含电负性基团组分流过检测器时,捕获电子而产生信号电流。. N 2 N 2 + + e 基流 AB + e AB - + E 捕获电子基流降低

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气相色谱法

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  1. 气相色谱法 Gas chromatography GC

  2. 火焰离子化检测器 FID

  3. 电子捕获检测器 (electron capturedetector,ECD) 利用辐射源产生的放射线使载气分子离子化,形成稳定的基流,组分流出色谱柱后,含电负性基团组分流过检测器时,捕获电子而产生信号电流。

  4. N2 N2++ e 基流 AB +e AB-+E 捕获电子基流降低 AB-+ N2+ AB +N2

  5. 火焰光度检测器 (flame photometric detector, FPD) 利用在富氢火焰中含硫、含磷化合物燃烧产生特征波长的光,经光电倍增管将光信号转化成电信号。 含S化合物发出394nm的特征谱线 含P化合物发出526nm的特征谱线

  6. 热离子检测器 (thermionic detector TID) 又称氮磷检测器 (nitrogen phosphorus detector NPD) 含氮含磷组分生成离子增加。 在喷嘴与收集极之间放置一碱金属化合物珠。Rb2O•SiO2 测定含N含P化合物时,灵敏度比FID高 50~100倍。

  7. 热导检测器 TCD (thermal conductivity detector) 由于导热系数不同 使热敏元件阻值发 生差异而产生信号

  8. 分离度R

  9. u最佳=(B/C) ½ H最小= A+2(BC) ½

  10. 定性分析方法 纯物质对照定性(1)分次进样比较法        (2)峰高增加法 文献保留值定性 与其它方法联合定性(1)离机操作          (2)联机操作 

  11. 定量计算方法 归一化法 外标法 内标法

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