Answer :
In gas chromatography, different detectors can be used depending on the specific compounds that need to be identified and quantified. For halogen-containing compounds, the most suitable detector is the Electron Capture Detector (ECD).
What is an Electron Capture Detector (ECD)?
The Electron Capture Detector is a highly sensitive detector used in gas chromatography, particularly effective for detecting electronegative compounds, such as those containing halogens (like chlorine, bromine, etc.). It works by capturing electrons, which reduces the overall current measured in the detector, thus indicating the presence of these compounds.
Why is ECD used for halogen-containing compounds?
Halogen-containing compounds tend to be highly electronegative. This characteristic allows them to effectively capture electrons, which is the basis of the ECD's operation. Hence, ECD is particularly suitable for halogen detection because it is extremely sensitive to these types of compounds, even at very low concentrations.
How does the ECD work?
The ECD consists of a radioactive source that emits beta particles (electrons). When these electrons interact with a carrier gas, they produce a constant current. When a halogen-containing compound passes through this detector, it captures some of these electrons, reducing the current. This change in current is detected and is directly related to the concentration of the halogen compound.
In conclusion, for detecting halogen-containing compounds specifically, the Electron Capture Detector (b) is the most appropriate choice.
