看GOOGLE的 Total Ion Chromatogram If all the signal intensities (all mass peaks) for one scan are added together, one obtains the total ion current. The total ion current reduces the two dimensional mass spectral data to one signal: the total ion signal collected during a given scan. Plotting the total ion current against time (or scan number) gives the Total Ion Chromatogram (TIC). When a data file is loaded into memory using the Data Analysis module, the TIC is drawn to the screen. Note that the TIC resembles any other chromatogram; it is detector signal vs. time. By displaying data as a TIC, the mass spectrometer is used as a general detector; there is no selectivity in the data. 大概意思是TIC是 total ion current对retention time的图谱，total ion current 得到的方式是所有的MASS peak加在一起所得到的电流，简单来说MS在这只是单纯的侦测 器，如FID、ECD等 图：http://ks.water.usgs.gov/Kansas/pubs/reports/ofr.01-10.fig1.gif Extracted Ion Chromatogram Suppose you were only interested in compounds that have an m/z 77 signal in the mass spectrum. This is part of the power of collecting the three dimensional GC/MS data. Instead of plotting the total ion current vs. time, one can choose to plot a single mass (or small range of masses) signal vs. time. This Extracted Ion Chromatogram (EIC) allows the mass spectrometer to be used as a selective detector. One can display data only for peaks of interest in cluttered TIC's. 大概意思你的cpds在m/z 77是感兴趣的，锁定此m/z对时间所做出的图谱，就是EIC了 是被用来当作选择性的侦测器 图：http://0rz.tw/ff3fY ※ 引述《hsuhiroko168 (就是那麽巧)》之铭言： : 最近在准备书报 : 想请问有没有人知道质谱层析图上面的TIC Total Ion Chromatogram : 或是EIC(Extracted Ion Chromatogram)的作用是什麽? : 很想知道答案 : 不过不知道哪里有相关的书籍 : paper提到的质谱 感觉跟仪分的部份配合不上 : 麻烦各位高手了 : 感激 --

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