首先,問題建立在錯誤的假設上。如果流動相沒了,泵的確會吸進去一些空氣,但是並不會持續的讓空氣流經整個係統。這是因為HPLC的泵是設計成專門用來吸取液體的,空氣一旦進入,泵就會失去灌注(lose prime)並停止工作。當(dang)然(ran),在(zai)泵(beng)完(wan)全(quan)停(ting)止(zhi)之(zhi)前(qian),一(yi)些(xie)氣(qi)泡(pao)可(ke)能(neng)會(hui)進(jin)入(ru)柱(zhu)子(zi),但(dan)是(shi)這(zhe)種(zhong)情(qing)況(kuang)不(bu)會(hui)一(yi)直(zhi)持(chi)續(xu)下(xia)去(qu)。就(jiu)算(suan)由(you)於(yu)某(mou)種(zhong)因(yin)素(su),柱(zhu)子(zi)裏(li)麵(mian)泵(beng)入(ru)了(le)大(da)量(liang)的(de)空(kong)氣(qi),損(sun)壞(huai)柱(zhu)子(zi)可(ke)能(neng)性(xing)也(ye)不(bu)是(shi)很(hen)大(da)。
那麼如果真的遇上這種情況,該如何處理呢?
dangranshiyaobakongqicongsuoyoutongdaolipaichulai。buguozaizhezhiqianzuihaobazhuziquxialai。shouxianhuanshangxindechedituoqihoudeliudongxiang,ranhoudakaipaiqifajinxingzhengchangguanzhu (prime the pump),對於有些型號的儀器,可能需要用注射器進行手動灌注。接下來要設定一個較高的流速(比如10 mL/min)並運行幾分鍾來徹底清除泵裏麵以及管道裏麵殘留的空氣。這一步完成之後將流速調至1mL/min 並關閉排氣閥,運行直到徹底沒有氣泡排出。然後將流動相換成100%的甲醇或者乙腈並衝洗一會兒,這兩種有機溶劑的粘度相對較低有助於清除係統管道和柱子中的空氣。
dierbujiushiruhepaichuzhuzizhongdekongqi。jiangzhuzijinkouduanlianshang,baoliuchukouduanbuyaojiejianceqi,keyijieshangyiduanguandaobingyongshaobeihuozhefeiyepingshoujipaichulaideliudongxiang。qidongbengbingzhubuzengdaliusuzhidaozhuyadadao3000-4000 psi (高壓能夠將氣泡壓縮回溶液並排出柱子),持續運行10分鍾左右直到沒有氣泡從柱子的尾端排出。檢測器中可能也會有殘留的氣泡,但是很容易通過衝洗清除。
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