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    The interpretation of gas chromatograms

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    A chromatogram would feature lines instead of peaks if:
    a) the best equipment available is used
    b) the separation is done by capillary electrophoresis
    c) if the temperature nears (or is equal to) the absolute zero
    d) neither of the above cases would suffice.

    B. Most modern chromatography instruments are equipped with:
    a) digital electronic peak integrators
    b) electrode potential control devices
    c) scanning probe attachments
    d) all of the above

    C. Contaminants in gas-chromatography are revealed by:
    a) a different level of the baseline
    b) an appearance of additional peaks
    c) sharper and narrower peaks
    d) inevitable peak broadening

    D. Consider the effect of mass diffusion on band broadening in a gas chromatographic column. How does this effect depend upon the flow rate of the mobile phase?
    a. The height equivalent to a theoretical plate decreases with an increase in the flow rate of the mobile phase.
    b. The height equivalent to a theoretical plate increases with an increase in the flow rate of the mobile phase.
    c. The height equivalent to a theoretical plate is independent of the flow rate of the mobile phase.
    d. There is insufficient information to answer the question.

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    Solution Preview

    Gas chromotography works by separating a chemical into different components. The sample is vaporized and injected onto the head of a chromatographic column where each component produces a distinctive peak. The ideal chromatogram has closely spaced peaks with no overlapping peaks.

    A chromatogram would feature lines instead of peaks if:

    c) if the temperature nears (or is equal to) the absolute zero

    At absolute zero, the sample would not mobilize, so there would be no peaks.

    B. Most modern chromatography instruments are ...

    Solution Summary

    This solution answers questions regarding the interpretations of chromatograms.

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