A big drawback of gas chromatography is that it does not produce specific identification. This problem is overcome by connecting the GC to a:

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Connecting the GC to a mass spectrometer (MS) allows for specific identification of the individual components in a mixture. The MS produces a mass spectrum for each compound, providing data on the molecular weight, structure, and identity of the components eluting from the GC column.

A Big Drawback of Gas Chromatography Is That It Does