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Answer :
Gas chromatography (GC) is a method used to separate and analyze compounds that can be vaporized without decomposition. It's a powerful tool in analytical chemistry for separating and analyzing compounds in complex mixtures.
Various detectors can be used in gas chromatography to identify and measure the components as they elute from the chromatographic column. Here is a breakdown of the detectors listed in your options:
UV-Vis Spectrophotometry: This detector uses ultraviolet and visible light to analyze the samples. It is widely used in liquid chromatography, not in gas chromatography. This is because most gases do not absorb UV or visible light to a significant extent, making this detector less effective for GC applications.
Electron Capture Detector (ECD): This is a widely used detector in gas chromatography. It is especially suited for detecting electron-absorbing compounds, such as halogens, making it useful in environmental analyses and detecting pesticides.
Thermal Conductivity Detector (TCD): Another common detector in GC, TCD works by measuring changes in thermal conductivity of the carrier gas caused by the presence of a sample. It's universal and can detect any compound that has a conductivity different from the carrier gas.
Ionization Detector: This can refer to several types such as Flame Ionization Detector (FID), which is very common in GC, especially for hydrocarbons.
Given these details, the correct answer to your question is that UV-Vis Spectrophotometry is not typically used in gas chromatography, as it is better suited for applications in liquid chromatography.
Hence, the chosen option is: UV-Vis Spectrophotometry.
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