【摘要】：電噴霧離子源(Electrospray Ionization source,ESI)可以很方便地分析極性物質(zhì),但難以分析非極性物質(zhì),而離子源的切換是一件麻煩的工作。我們嘗試改造常規(guī)ESI成電暈噴霧離子源(Coronal Spray Ionization source,CSI),使它也能夠分析非極性物質(zhì),檢測器為一臺飛行時間質(zhì)譜儀。我們將高達(dá)2 500~5 000伏特的高壓加到一根60μm內(nèi)徑的不銹鋼毛細(xì)管上,將其作為電噴霧源。當(dāng)加的高壓高達(dá)3 500伏特或以上時,在不銹鋼管尖端會出現(xiàn)微小的電暈,這部分電暈的作用便是用來電離弱極性或是非極性物質(zhì)。通過調(diào)節(jié)加到不銹鋼管上的電壓,這套裝置可以檢測到不同種類的弱極性物質(zhì),而不需要對裝置本身做太多的改動或是卸掉儀器的真空。我們在這套CSI上成功測到了萘和芘,而ESI無法檢測出這兩種物質(zhì)。另外我們將其信號強(qiáng)度與APCI對比,發(fā)現(xiàn)在同一數(shù)量級上。
[Abstract]:Electrospray ion source (Electrospray Ionization source,ESI) can easily analyze polar substances, but it is difficult to analyze nonpolar substances. The switching of ion sources is a troublesome task. We try to transform conventional ESI into corona spray ion source (Coronal Spray Ionization source,CSI) so that it can also be used to analyze nonpolar matter. The detector is a time of flight mass spectrometer. A high pressure of up to 2 500 ~ 5 000 volts was added to a 60 渭 m stainless steel capillary tube as an electrospray source. A tiny corona occurs at the tip of a stainless steel tube when the added high pressure is as high as 3 500 volts or above. This part of the corona is used to ionize weakly polar or nonpolar substances. By adjusting the voltage applied to the stainless steel tube, the device can detect different kinds of weakly polar substances without having to make too many changes to the device itself or remove the vacuum of the instrument. We have successfully detected naphthalene and pyrene on this set of CSI, which cannot be detected by ESI. In addition, we compare the signal intensity with APCI and find that it is of the same order of magnitude.
【作者單位】： 廈門大學(xué)化學(xué)化工學(xué)院譜學(xué)分析與儀器教育部重點實驗室;
【基金】：國家自然科學(xué)基金項目(20775063,21027011)資助
【分類號】：O657.63
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本文編號：2259840