![]() The NIST 2005 library, which is a software feature of the GC/MS data acquisition system, will be utilized to confirm the identification of the components of the unknown. Thus, the characteristic features of a mass spectrum for a given class may be recognized, and the chemical structure determined. In this lab, the ITD spectrum you measure of the unknown will be compared to the EI spectra of several different classes of compounds found in the library. These classical spectra are used in the National Bureau of Standards library of mass spectra for comparison differences. Due to the design variances of the ITD compared to a true quadrupole mass spectrometer, the ITD mass spectrum of an organic compound may not be identical (but should be very similar) to its classical mass spectrum measured by an electron impact (EI) detector. The ITD is a variation of a quadrupole mass spectrometer and is designed to function specifically as a GC detector. The analysis of different unknown mixtures will be performed via high resolution capillary gas chromatography (GC) coupled with an ion trap detector (ITD). This lab has an added challenge of first identifying what the contents of those standards are before being drawing conclusions about the mixtures. Similar to the CHE 105, you will be responsible for separating the components of a mixture by comparing the results to standard solutions. ![]()
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