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常用的色譜儀器有哪兩大類,各自有何特點-上海91福利在线观看分析儀器有限公司

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常用的色譜儀器有哪兩大類,各自有何特點

更新時間:2010-11-02點擊次數:4807
    目前比較成熟的色譜儀主要是91福利片导航网與液相色譜儀兩大類。91福利片导航网具有高分辨率、高速度、高靈敏度及選擇性好等優點。但91福利片导航网隻能用於被氣化物質的分離、檢測。
     液相色譜的樣品無需經氣化而直接導入色譜柱進行分離、檢測,特別適用於氣化時易分解的物質的分離、分析。除了在樣品的適用麵方麵的差異外,液相色譜儀與91福利片导航网另一個顯著差異是在流動相選擇上。91福利片导航网僅能用氫氣、氮氣、氬氣或氦氣等少數幾種氣體。由於它們性質相近,對分離條件改善的作用不大。但液相色譜儀可供選擇溶劑多種多樣,其極性、粘性、pH值、濃度等均可改變,這些都能調整樣品在兩相間分配的差異,進而有效地改善分離條件,達到改善分離的zui終目的。


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