RelativeResourceManager(15) - Liquid chromatography Chem...

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Liquid chromatography Chem 420 October 27, 2008 Professor Ryan C. Bailey
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Problem Set #3 z Posted on Compass. z Due in class on Wednesday (October 29) z Note: This is two days later than the syllabus states. z Assignments are due at beginning of class—starts at 12 Noon! z For full credit assignments must be in box when the lecture begins. z Any assignment turned in between noon and 12:05 PM will automatically be deducted 5 points. z Assignments will NOT be accepted for credit after 12:05 PM. z Score = 0
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Recap from last class z What term in the van Deemter equation is of particular importance in GC? Why? z What is the most common GC detector? What are its advantages? z Flame ionization detector: General response to all organics, high sensitivity (~100 fg/s), and large linear dynamic range (~10 7 ) z What is the most common format for a GC column? z What types of materials are often used for GC stationary phases? z What is a good general guide of retention times? z If polarities are matched what guides the elution order? z How does GC combat the general elution problem? z How can retention times be reduced? γ = 2 m D B uu () R t1 a L k u =+
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Questions?
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Liquid chromatography z Most widely used analytical separation technique z Sensitive, readily quantitative, easy to automate, good for nonvolatile or thermally unstable solutes. z Many variations to fill many needs in modern research. z HPLC: High-performance (or high-pressure) liquid chromatography Molecular mass
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van Deemter and beyond: considerations in LC z van Deemter relationship, discussed on 10/20, holds for LC.
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RelativeResourceManager(15) - Liquid chromatography Chem...

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