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12. (16 pts) A researcher performed a chromatographic separation of caffeine and aspartame using methanol as...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retent...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, lc, was found to be 203.8 s with a baseline peak width, wc, of 13.8 s. The retention time for aspartame, ta, was 272.4 s with a baseline peak width, wa, of 21.5 s. The retention time for the unretained solvent methanol was 43.7 s Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.7...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine,...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, is, was found to be 218.0 s with a baseline peak width, wc, of 14.4 s. The retention time for aspartame, 1., was 250.5 s with a baseline peak width, w of 21.1 s. The retention time for the unretained solvent methanol was 40.4 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 27.7...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine,...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, tc,was found to be 207.6 s with a baseline peak width, wc, of 16.2 s. The retention time for aspartame, ta, was 253.7 s with a baseline peak width, wa, of 18.7 s. The retention time for the unretained solvent methanol was 40.7 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 27.3 cmlong...
1. Listed below are retention times and peak widths for an HPLC chromatographic separation on a...
1. Listed below are retention times and peak widths for an HPLC chromatographic separation on a 10 cm C18 column a) Calculate the resolution between benzene and benzo[e]pyrene. Compound Unretained Benzene Benzo[e]pyrene Pyrene Coronene Time (min) Baseline Width (min) 0.9 10.9 13.3 16.7 26.1 0.40 0.40 0.45 0.50 b) Is this a good resolution, yes, no, why? c) Calculate the theoretical number of plates for benzo[elpyrene.
(3) During the separation of two steroids by HPLC on a C18 column, a student reported the following elution times with...
(3) During the separation of two steroids by HPLC on a C18 column, a student reported the following elution times with a certain % acetonitrile/water mobile phase (uracil was added to the steroid mixture) tm (uracil) 1.2 min t, (steroid1) 4.55 min t, (steroid2) 6.55 min base width, w (steroid 1) 0.56 min base width, w (steroid 2) 0.79 min a. Sketch the chromatogram to illustrate the above separation. Label the peaks and the x- and y-axis. Calculate the resolution...
Consider a separation performed on a 45.0 mm long open tubular column with a 0.50 mm...
Consider a separation performed on a 45.0 mm long open tubular column with a 0.50 mm diameter, and a 2.0 um thick stationary phase. Compound A eluted at 12.41 min, compound B eluted at 13.34 min, and the unretained solvent eluted at 1.130 min. What are the adjusted retention times, t, and retention factors, k, for compounds A and B? Number Number min Number Number min rB What is the relative retention, a, for this separation? Number roll down to...
2.0 EXAMPLEI : The following data were obtained for a separation using a 0.5 mm id,...
2.0 EXAMPLEI : The following data were obtained for a separation using a 0.5 mm id, 10 meter open tubular column: Retention time (min) Peak base width (min) Methane Cyclohexane 8.0 0.65 Methylcyclohexane 8.17 0.72 Toluene 10.2 0.95 a)Draw the chromatogram and label the peaks b) Calculate the number of theoriticla plate for each compound (N) and palte height (H) c) Calculate the capacity factor for each compound d) the resolution between tow consequent peak R, e) Calculate the length...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, lc, was found to be 203.8 s with a baseline peak width, wc, of 13.8 s. The retention time for aspartame, ta, was 272.4 s with a baseline peak width, wa, of 21.5 s. The retention time for the unretained solvent methanol was 43.7 s Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.7...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, is, was found to be 218.0 s with a baseline peak width, wc, of 14.4 s. The retention time for aspartame, 1., was 250.5 s with a baseline peak width, w of 21.1 s. The retention time for the unretained solvent methanol was 40.4 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 27.7...
1. Listed below are retention times and peak widths for an HPLC chromatographic separation on a 10 cm C18 column a) Calculate the resolution between benzene and benzo[e]pyrene. Compound Unretained Benzene Benzo[e]pyrene Pyrene Coronene Time (min) Baseline Width (min) 0.9 10.9 13.3 16.7 26.1 0.40 0.40 0.45 0.50 b) Is this a good resolution, yes, no, why? c) Calculate the theoretical number of plates for benzo[elpyrene.
(3) During the separation of two steroids by HPLC on a C18 column, a student reported the following elution times with a certain % acetonitrile/water mobile phase (uracil was added to the steroid mixture) tm (uracil) 1.2 min t, (steroid1) 4.55 min t, (steroid2) 6.55 min base width, w (steroid 1) 0.56 min base width, w (steroid 2) 0.79 min a. Sketch the chromatogram to illustrate the above separation. Label the peaks and the x- and y-axis. Calculate the resolution...
Consider a separation performed on a 45.0 mm long open tubular column with a 0.50 mm diameter, and a 2.0 um thick stationary phase. Compound A eluted at 12.41 min, compound B eluted at 13.34 min, and the unretained solvent eluted at 1.130 min. What are the adjusted retention times, t, and retention factors, k, for compounds A and B? Number Number min Number Number min rB What is the relative retention, a, for this separation? Number roll down to...
2.0 EXAMPLEI : The following data were obtained for a separation using a 0.5 mm id, 10 meter open tubular column: Retention time (min) Peak base width (min) Methane Cyclohexane 8.0 0.65 Methylcyclohexane 8.17 0.72 Toluene 10.2 0.95 a)Draw the chromatogram and label the peaks b) Calculate the number of theoriticla plate for each compound (N) and palte height (H) c) Calculate the capacity factor for each compound d) the resolution between tow consequent peak R, e) Calculate the length...
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