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The most common detectors used in gas chromatography are the flame ionization detector (FID), the electron capture detector (ECD), and the mass spectrometer (MS). The FID is a relatively simple and inexpensive detector that is used to detect organic compounds that contain carbon and hydrogen. The ECD is a more sensitive detector that is used to detect compounds that contain halogens or other electronegative atoms. The MS is the most versatile detector and can be used to identify and quantify a wide variety of compounds.