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Answer :
Final answer:
The GC detector that works by measuring changes in specific heat is the thermal conductivity detector (TCD).
Explanation:
Gas chromatography (GC) detectors are used to detect and quantify the components of a sample separated by the GC column. Each detector operates based on a specific measurement principle. Let's explore the detectors mentioned in the question and their measurement principles:
- Atomic Emission Detector: The atomic emission detector measures the intensity of light emitted by excited atoms or ions. It is used to detect elements that emit characteristic wavelengths of light.
- Electron Capture Detector: The electron capture detector measures the decrease in current caused by the capture of electrons by analyte molecules. It is commonly used to detect halogenated compounds.
- Flame Ionization Detector: The flame ionization detector measures the ions produced when organic compounds are burned in a hydrogen flame. It is widely used for the detection of hydrocarbons.
- Mass Spectrometer Detector: The mass spectrometer detector measures the mass-to-charge ratio of ions produced by the analyte molecules. It provides detailed information about the molecular structure and composition of the sample.
- Thermal Conductivity Detector: The thermal conductivity detector (TCD) measures changes in the thermal conductivity of the carrier gas caused by the presence of analyte molecules. It is sensitive to changes in specific heat and is commonly used for the detection of non-volatile and polar compounds.
Based on the above information, the GC detector that works by measuring changes in specific heat is the thermal conductivity detector (TCD).
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