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氣相色譜出現“N“ 或 “W”峰及舌頭峰的原因-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“N“ 或 “W”峰及舌頭峰的原因

更新時間:2021-11-17點擊次數:6112
  一、"N" 或 “W”峰出現的原因
 
  1、TCD操作,用N2作載氣由於熱傳導率非線性引起;
 
  2、FID操作時,樣品溶劑電離效率低(如CS2),或氣流比欠佳時;
 
  3、ECD操作時,由於檢測器被汙染,溶劑峰或待測組分含量較高,或脈衝電源有毛病。
 
  二、舌頭峰(前延峰)出現的原因
 
  1、汽化溫度偏低;
 
  2、載氣流量小:
 
  3、進樣量大,汽化時間長;
 
  4、汽化室被汙染,樣品有吸附效應;
 
  5、樣品在柱頭有冷凝或色譜柱被汙染;
 
  6、進樣技術差(揮發性組分的進樣速度太慢);
 
  7、峰前出現了“鬼”峰。
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