Discussion
Match the following :
| GLC Detector | Applicable Samples |
|---|---|
| (a) Flame Ionization | (i) Universal detector |
| (b) Thermal Conductivity | (ii) Halogenated compounds |
| (c) Electron Capture | (iii) Nitrogen and Phosphorus compound |
| (d) Thermionic | (iv) Hydrocarbons |
Choose the correct answer from the options given below :
Answer: A
The correct match is a-iv, b-i, c-ii, d-iii.
- Flame ionization detector: responds to carbon-hydrogen bonds burnt in a hydrogen flame, so it is the detector for hydrocarbons and most organic compounds.
- Thermal conductivity detector: senses any change in the thermal conductivity of the carrier gas, so it responds to every compound and is the universal detector.
- Electron capture detector: highly sensitive to electronegative atoms, so it is used for halogenated compounds such as organochlorine pesticides.
- Thermionic (nitrogen-phosphorus) detector: selective for compounds containing nitrogen and phosphorus.
Every other option pairs at least one detector with the wrong class, for example the electron capture detector with nitrogen and phosphorus compounds.
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