Answer :
Final answer:
The detector that measures conductivity changes based on temperature in a gas chromatography column is the Thermal Conductivity Detector (TCD). It operates by comparing the thermal conductivities of the carrier and sample gases, and uses changes in electrical resistance to represent compound concentrations.
Explanation:
The gas chromatography detector that measures changes in the conductivity as a function of temperature of the gas stream exiting the column is a Thermal Conductivity Detector (TCD). This detector works by comparing the thermal conductivity of two gas streams: the carrier gas (reference gas) and the sample gas. Any difference sensed as the sample elutes from the column alters the temperature, which in turn alters the electrical resistance of a wire located in the detector. This change in resistance represents the change in concentration of the compound in the sample gas, thus giving the chromatographic signal.
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