Sometimes you know which compound you are looking for, but you do not know where it appears in the chromatogram. In this video, I show how I use the NIST mass spectral library and extracted-ion chromatograms to locate a specific compound in GC/MS data. I cover: • Searching the NIST library for the compound • Reviewing the reference mass spectrum • Selecting characteristic ions • Returning to the sample chromatogram • Extracting those ions from the data • Looking for peaks whe

Unknown GC/MS peaks can be screened against a mass spectral library to help with tentative identification. In this video, I show how I use the TIC Library Search function in Agilent EnviroQuant with the NIST mass spectral library. I cover: • Opening the TIC Library Search function • Selecting the NIST library • Setting search and integration parameters • Running a library search across the chromatogram • Reviewing tentative compound identifications • Comparing match quality •