Modern GC/MS instruments normally have a library of compounds which were compared with your sample when it ran. When data are generated it is observed that many compounds are suggested for a single peak and there is not just one peak but many, this normally leads to confusion.
The first thing that should be done is calculate the retention index (RI) for each peak and compare to literature reports. For higher quality data it is best to perform the analysis on two columns - one polar and one non-polar - to obtain two sets of RIs. Two columns also gives you different elution patterns to ensure you are seeing all peaks and to minimize the chance of co-elutions. Finally, it is best to verify the tentative peak assignments and fragmentation patterns with authentic standards. Please feel free to email me with further questions.
One thing more that could help you is to substract the baseline background of your chromatogram. This fact usually improves your match for each signal and greatly reduces the number of compounds suggested by your mass spectra library.
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