Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 17 Chromatography Page 304 of 316Plate count depends on retention time:Why does the plate count go up for the more retainedpeaks?Because more retained peaks are expected to getbroader by longitudinal diffusion – but these donot.N:2⎛ 400 ⎞⎜ ⎟⎠ = 1024⎝ 12.52⎛ 1200 ⎞⎜ ⎟ = 9216 N⎝ 12.5 ⎠2⎛ μ ⎞⎜ ⎟⎝ σ ⎠2⎛ 800 ⎞⎜ ⎟⎠ = 4096⎝ 12.52⎛ 1600 ⎞⎜ ⎟ = 16384⎝ 12.5 ⎠Illustration of different plate counts0.030.0250.02signal0.0150.010.00500 200 400 600 800 1000 1200 1400 1600 1800 2000retention time or column lengthPage 304 of 316
Chem 155 Unit 17 Chromatography Page 305 of 316The van Deemter Equation:H = plate heightA = ‘multipath term’B = longitudinal diffusion termC = resistance to mass transferPlate height as a function of linear flow rate:H A+ B + C⋅uu12108H12 ( , , 0.5,u)6420 2 4 6 8 10 12uRationalize why is there an optimum flow rate:Excessive flow rate can exceed the rate ofpartitioning into and out of the stationary phase.Very slow flow allows too much time fordiffusional broadening.Page 305 of 316
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