Match the detector or detectors that can be used in gas chromatography for the d

Question

Match the detector or detectors that can be used in gas chromatography for the detection of the following list of analytes by dragging the detector into the box to the left of the analyte. (More than one detector may be appropriate for a given analyte, and a given detector may be appropriate for more than one group of analytes.) 1. Carbon atoms bearing hydrogen atoms 2. Molecules with halogens, CN, NO2, conjugated C=O 3. Aromatic and unsaturated compounds 4. P and S and other elements selected by wavelength. 5. P and N (and also hydrocarbons) 6. S

choices are: flame ionization, electron capture, flame photometric, nitrogen-phosphorus, photoionazation, sulfur chemiluminescence, mass spectrometer, thermal conductivity

I input the choices in the blanks and got this message: "Incorrect. The sulfur chemiluminescence detector is not used to detect P, S, and other elements selected by wavelength. There are two universal detectors that can be used to detect all the analytes listed. The specific detector used to detect this group of analytes measures light emitted from the elements when excited by a hydrogen-air flame."

Explanation / Answer

Mass spectrometer, thermal conductivity detectors are universal and can detect all the given analytes.

1. Carbon atoms bearing hydrogen atoms : flame ionization

2. Molecules with halogens, CN, NO2, conjugated C=O: electron capture

3. Aromatic and unsaturated compounds: flame ionization, photoionazation

4. P and S and other elements selected by wavelength: photoionazation

5. P and N (and also hydrocarbons): nitrogen-phosphorus, photoionazation

6. S: sulfur chemiluminescence, photoionazation

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