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移液器的檢測和校準(zhǔn)指南

時間:2011/10/13閱讀:586
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乾思 生物編輯整理:
一、實驗室簡單檢測
(一)氣密性檢測
移液器吸滿液體后,,手持垂直放置15s,檢查吸嘴的尖頭有無液滴,如有,,則說明漏氣。
(二)準(zhǔn)確性檢測
1)量程小于1μl,,建議使用分光光度法檢測,。將移液器調(diào)至目標(biāo)體積,然后移取染料溶液,,加入一定體積的蒸餾水中,,測定溶液的稀釋度(334nm或340nm),,重復(fù)幾次移液操作,計算移液器的度,。
2)量程大于1μl,,可以用稱重法檢測。通過對水的稱重,,轉(zhuǎn)換成體積(體積=質(zhì)量/密度),,鑒別移液器的準(zhǔn)確性。由于水的密度是隨著溫度變化而變化,,且稱量天平本身度不符合檢測要求,,檢測又大多在一個開放式空間內(nèi)操作,偏差在所難免,。因而,,此種稱量法只能現(xiàn)場粗略地判斷移液器的準(zhǔn)確性,進(jìn)一步的校準(zhǔn)必須在專業(yè)的實驗室操作進(jìn)行,。
注意:稱重法實驗室*條件是高度靈敏的分析天平(定期校準(zhǔn)),、雙蒸水和稱量容器。水,、移液器和吸嘴必須具有相同的溫度(20℃時水的密度為0.09982),。
二、專業(yè)校準(zhǔn)
移液器的工作量大,,長期使用,,將會使彈簧彈力發(fā)生變形,加之本身是塑料,,不耐磨擦,,就會產(chǎn)生誤差。為了保證移液器傳遞液體量的準(zhǔn)確性,,必須對移液器進(jìn)行定期校準(zhǔn),。為了更好地發(fā)揮該類計量儀器的作用,對新購進(jìn)的儀器要進(jìn)行校準(zhǔn)才能使用,;對正在使用的計量儀器,,由于長期使用會造成其示值于度量對象的誤差,這種誤差若不進(jìn)行控制,,及時校正,,必定會影響科研工作。因此,,對使用的移液器要定期檢定,、校正,并建立檔案,只有這樣才能使其在日常工作中更好的發(fā)揮作用,。

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