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a. Describe two (2) aspects of capillary electrophoresis (CE) that are different with HPLC. (2 marks) b. You are given a task to analyze orange juice sample containing aromatic hydrocarbons. They are benzene, toluene, ethyl benzene and isomers of xylenes (BTEX) (Figure 2). Explain how you would select a capillary electrophoresis method that suitable to analyze these 6 compounds. Your explanation should be based on the chemical properties of the compounds and fundamental characteristics of the CE method you are considering. (8 marks)
c. Analysis of a sample solution Y by Gas Chromatography shows the presence of four components, A, B, C, and D, as illustrated in Figure 3. Figure 3. Chromatogram of sample solution Y analysed by gas chromatography. Answer the following questions, and briefly explain your answer. i. Which compound is present in the greatest quantity? ii. Which compounds were present in equal amounts? iii. Which compound had the strongest interaction with the stationary phase? iv.Assuming that the capillary column is nonpolar, which peak corresponds to the least and most polar component of the mixtur v. Roughly predict the appearance of a chromatogram for the same sample if the