Problem_Set_IV_-_Gas_Chromatography - respond(a thermal...

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Problem Set I V – Gas Chromatography 1. (a) What are the relative advantages and disadvantages of packed and open tubular columns in gas chromatography? (b) Explain the difference between wall-coated, support-coated, and porous- layer open tubular columns. 2. (a) Why do open tubular columns provide greater resolution than packed columns in gas chromatography? (b) Why do H 2 and He allow more rapid linear flow rates in gas chromatography than N 2 does, without loss of column efficiency? 3. (a) When would you use split, splitless, or on column injection in gas chromatography? (b) Explain how solvent trapping and cold trapping work in splitless injection. 4. To which kinds of analytes do the following gas chromatography detectors
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Unformatted text preview: respond? (a) thermal conductivity (b) flame ionization (c) electron capture (d) mass spectrometer 5. Why does a thermal conductivity detector respond to all analytes except the carrier gas? Why isn’t the flame ionization detector universal? 6. An unretained solute passes through a chromatography column in 3.7 min and analyte requires 8.4 min. (a) Find the adjusted retention time and capacity factor for the analyte. (b) The volume of the mobile phase is 1.4 times the volume of the stationary phase. Find the partition coefficient for the analyte. 7. How can you improve the resolution between two closely spaced peaks in gas chromatography?...
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