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- Mass spectrometry is an extremely versatile detection system for GC. However, interfacing an HPLC system to a mass spectrometer is a much more difficult task. Describe the major reasons why it is more difficult to combine HPLC with mass spectrometry than it is to combine GC with mass spectrometry.1) Study the chromatograph (below) of a mixture of Compounds A and B, run on the GCs in the teaching labs at CU Boulder. Compound A has the shorter retention time. STAAT 61 1.11 227 RT TYPE AREA XXXX XXXX XXXX AREAS 0.009 55874 44.117 ARIHT 0.61 XX XX XX 1.11 2.27 XX XX XX TOTAL AREA=XX MUL FACTOR=XX 1. What is the retention time of compound A? Compound B? 2. Which compound is present in a larger amount? 3. Which compound has the lower boiling point? 4. What would happen to the retention times of compounds A and B if the column temperature were raised? 5. You suspect that compound B is octane. What can you do to provide supporting evidence for this hypothesis?QUESTION T5 Why were the areas underneath the peaks in the gan chromatographs you eobtained mutiplied by a weight tactor? DA the corrction factor compensates for user error OB Rame lonization detectors (FID) respond slightly dfferent to compounds with diferent molecular weights OCnone of the answers OD. the GC (GOW MAC 350) used contains a quadrapole mass spec detector whose response must be corrected for the miz ratio of the diferent ions obtainen for diferert moleculestune OE not all molecules have the same themmal conductivity QUESTION 16 Which list of functional groups is present in the anti-viral drug Arbidol HO Br O A Thioether, alkene, ester, amide, amine O 8. Thioether alcohol, ester, amine OC Alcohol, ether, amide, epoxide, thioester OD. Ether, ketone olefin, amine, alcohol O E Thioalcohol, alkene, ether, amine, nitro
- The following chromatogram is obtained for a mixture of substances X and Y. Calculate the number of plates for peak X. Y 10 11 12 13 14 Tim e (min) O A. 1234 O B. 2116 OC. 1102 O D. 1936 O E. 1488 Instrument response in arbitrary unitsAnalysis of an unknown plant extract yield two peaks X and Y in a chromatogram, 15.65 and 17.03 min respectively in a 30.0 cm column. The peak base width for X is 1.06 and 1.15 for Y. The average number of plates in the column isDescribe with illustrations the observed peak for a chromatogram with the following tailing factors (TF): a. TF = 1b. TF > 1c. TF < 1
- One disadvantage of thin layer chromatography is that... it cannot be used for quantitative measurements. O it consumes large volumes of solvents O it cannot analyze volatile samples it cannot be used to analyze many samples simultaneously it requires a large amount of sample for analysisIn chromatography the concentration of a separated compound is directly related to a) stationary phase concentration b) absorbance c) wavelength d) peak areaThe following data give the recovery of bromide from spiked samples of vegetable matter, measuredusing a gas–liquid chromatographic method. The same amount of bromide was added to each specimen(Roughan, J.A., Roughan, P.A. and Wilkins, J.P.G., 1983, Analyst, 108: 742).Tomato: 777 790 759 790 770 758 764 ug/gCucumber: 782 773 778 765 789 797 782 ug/g(a) Test whether the recoveries from the two vegetables have variances which differ significantly.(b) Test whether the mean recovery rates differ significantly.
- How does paper chromatography allow you to separate substances?A) Given the following set of data, plot the chromatogram (absorbance versus volume of eluate). Vol of eluate (mL) Abs (560 nm) 0.5 0.182 1 0.108 1.5 0.042 2 0.02 2.5 0.015 3 0.083 3.5 0.052 4 0.03 4.5 0.011 0.004 5.5 6. 0.001 6.5 0.0013. The lead in a swab sample, lead standards, together with a blank were made up in 5.00 mL volumetric flasks using 0.2 % HNO3. 20 μL aliquots of these solutions were injected into the spectrophotometer and the absorbance measured at 217 nm. The following results were obtained. lead / ppb Absorbance 0 0.0591 10.00 0.0858 50.00 0.1926 100.0 0.3260 150.0 0.4594 200.0 0.5929 Swab sample 0.3700 (a) Determine the amount of lead in the swab sample in μg.