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氣相色譜分析“鬼峰”產生原因-上海91福利在线观看分析儀器有限公司

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氣相色譜分析“鬼峰”產生原因

更新時間:2021-11-17點擊次數:8159
  氣相色譜分析儀“鬼峰”亦指怪峰,多餘峰,記憶峰,其出現的原因分析如下:
 
  1、上一次進樣的高沸點雜質峰自然流出;
 
  2、載氣不純過濾器失效使低沸點的汙染物冷凝在色譜柱頭,程序升溫時正常流出;
 
  3、注射墊未經老化或無隔墊清洗而出的汙染峰;
 
  4、汽化溫度太高或嚴重汙染至使樣品某些組分分解;
 
  5、樣品某些組分與被汙染固定相產生了作用;
 
  6、色譜柱溫度太高固定相分解;
 
  7、使用了被汙染的注射針(本身不合格,手摸或進過易汙染的樣品);
 
  8、樣品予處理不完善或用錯溶劑;
 
  9、樣品中有空氣;
 
  10、TCD、ECD等密封性差(漏氣);
 
  11、電源不穩,對控溫或放大器有不良影響;
 
  12、色譜柱堵塞物使用不當,如玻璃棉未按要求進行處理。
 
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