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Answer :
For the determination of CO₂, CO, and N₂ in gas chromatography, a thermal conductivity detector (TCD) and a nonpolar stationary phase like PDMS on a nonpolar capillary column would be suitable.
To determine CO₂, CO, and N₂ using gas chromatography, an appropriate detector and stationary phase need to be selected.
For the detection of these gases, a thermal conductivity detector (TCD) would be suitable. A TCD operates based on the difference in thermal conductivity between the carrier gas and the analyte. Since CO2, CO, and N2 have different thermal conductivities than the carrier gas (usually helium or nitrogen), the TCD can detect their presence and provide corresponding signals.
As for the stationary phase, a nonpolar phase such as a nonpolar capillary column coated with a nonpolar stationary phase like polydimethylsiloxane (PDMS) would be appropriate. Nonpolar stationary phases allow for good separation of nonpolar and slightly polar compounds like CO₂, CO, and N₂. The nonpolar nature of the stationary phase allows for the retention and separation of these analytes based on their volatility and molecular interactions.
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