Chapter 27: Q.27.1 (page 741)
How do gas-liquid and gas-solid chromatography differ?
Gas-solid chromatography (GSC) involves the passing of volatile components through a solid stationary phase, and, in the gas-liquid phase, the movement of involatile constituents takes place through a mobilized liquid surface.
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What are the advantages of fused-silica capillary columns compared with glass or metal columns?
One method for quantitative determination of the concentration of constituents in a sample analyzed by is the area-normalization method. Here, complete elution of all of the sample constituents is necessary. The area of each peak is then measured and corrected for differences in detector response to the different eluates. This correction involves dividing the area by an empirically determined correction factor. The concentration of the analyte is found from the ratio of its corrected area to the total corrected area of all peaks. For a chromatogram containing three peaks, the relative areas were found to be , , and in the order of increasing retention time. Calculate the percentage of each compound if the relative detector responses were , , and , respectively
How does a soap-bubble flow meter work?
What is the difference between a concentration-sensitive and a mass-sensitive detector? Is the mass or concentration of the following detector sensitive?
() thermal conductivity.
() atomic emission,
() thermionic,
() electron captive,
() flame photometric,
() flame ionization.
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