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氣相色譜出現台階峰和負峰的原因-上海91福利在线观看分析儀器有限公司

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氣相色譜出現台階峰和負峰的原因

更新時間:2021-11-17點擊次數:12114
  一、台階峰
 
  1、TCD熱絲被樣品中所含鹵素、氧、硫等元素腐蝕;
 
  2、氣體流量突變如:注射墊突然漏氣,氣路受阻等;
 
  3、記錄色譜峰裝置故障如:拉線鬆。
 
  二、負峰
 
  1、TCD用氮做載氣,由於待測組分在N2中濃度不同,熱傳導值呈現非線性而可能出現負峰,有時可以通過改變載氣流量或進樣量克服;
 
  2、操作ECD時進樣量過大而出負峰,這是由於工作原理由電子捕獲轉變為電離檢測,此時靈敏度還會大大降低;
 
  3、操作FID,低電離效率的溶劑(如CS2)或雜質出現,使原基流較高的輸出基線減小而顯示為負峰;
 
  4、操作FID,在無極化電壓,樣品量較大可能出現負峰;
 
  5、操縱NPD、FPD時氣流比不合適,溶劑或某些組分會出現負峰。
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