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91福利片导航网手動進樣的主要要求-上海91福利在线观看分析儀器有限公司

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91福利片导航网手動進樣的主要要求

更新時間:2021-11-17點擊次數:5222
  1、進樣速度要快。
 
  取樣後,一手持注射器,另一手保護針尖(防止插入時彎曲),小心地將針頭穿過隔墊,隨即以zui快的速度將注射器插到底,同時迅速將供試品注射入汽化室,然後快速拔出注射器。
 
  2、取樣量要準確。
 
  3、為避免供試品之間的相互幹擾。取樣前先用供試品溶劑洗針至少3次(抽滿針管的2/3,再排出),再用要分析的供試品洗針至少3次。
 
  4、選用合適的注射器。GC分析zui常用的是10μl微量注射器,其進樣量一般不要小於1μl。進樣量要控製在1μl以下,就應采用5μl或1μl的注射器,由於此類注射器往往是將供試品抽在針尖內,取樣時應反複推拉針芯,以確保針尖內沒有氣泡。
 
  5、微量注射器用後必須用甲醇等有機溶劑清洗幹淨
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