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色譜儀檢定的方法-上海91福利在线观看分析儀器有限公司

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色譜儀檢定的方法

更新時間:2011-05-19點擊次數:4750

液相色譜儀   
實驗室液相色譜儀是由輸液係統、進樣器、色譜柱、檢測器和數據記錄處理裝置等幾部分組成的分析儀器。
液相色譜儀組成方框圖。它利用樣品中各組分在色譜柱中固定相和流動相間分配係數或吸附係數的差異,將各組分分離後進行檢測,並根據各組分的保留時間和響應值進行定性、定量分析。主要檢定項目:泵流量設定值誤差SS、流量穩定性誤差檢定輸液係統定性、定量重複性zui小檢測濃度、基線噪聲、基線漂移   
      關於zui小檢測濃度的檢定,規程規定“在靜態條件下,用注射器注入標準物質”然後用zui小檢測限公式計算,得出結論(所謂靜態條件,即在不開泵的情況下,把樣品直接注入樣品池)。但由於近年來液相色譜儀結構設計有了較大的改變,尤其是計算機工作站的引入,使它的超作方式更為簡化。
     因而,原來規程所規定的檢測方法已不在適用。對於它的檢定應在動態條件下(即正常的開機進樣情況),注入20ΜL標準物質,然後用zui小檢測限公式進行計算。若儀器的進樣筏小於20ΜL應把測得的峰高換算成20ΜL時的峰高(20ΜL/進樣筏容量*所測峰高)。以上測量方法與即將出版的液相色譜儀新檢定規程上的方法是相同的。   
      至於基線噪聲和基線漂移按照規程所規定的條件對儀器進行設定後,使儀器空走半小時即可在色譜圖中讀出。單位AU是一個紫外吸收的單位,一般它與單位MV是相對應的,如果儀器色譜圖上顯示的單位是MV,可以通過查找儀器說明書找到換算關係。   

檢定原理:依據JJG705-90《實驗室液相色譜儀計量檢定規程》。   
檢定周期:兩年

相關關鍵詞:氣相色譜分析儀,變壓器油色譜分析儀,天然氣分析儀,91福利片导航网價格
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