课程名称︰分析化学丙 课程性质︰必带 课程教师︰何国荣 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰2012/01/11 考试时限（分钟）：110分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1. Suppose that the concentration of NaF and KCl were each 0.10M in the cell. (15%) Pb(s)│PbF2(s)│F-(aq)││Cl-(aq)│AgCl(s)│Ag(s) AgCl(s)+e-→Ag(s)+Cl-(aq) Eo=0.222V PbF2(s)+2e-→Pb(s)+2F-(aq) Eo=-0.350V Ag+(aq)+e-→Ag(s) Eo=0.799V Ksp for AgCl=1.8*10^(-10) Pb2+(aq)+2e-→Pb(s) Eo=-0.216V Ksp for PbF2=3.6*10^(-8) (a) Using the half-reactions 2AgCl(s)+2e-→2Ag(s)+2Cl-(aq) and PbF2(s)+2e-→Pb(s)+2F-(aq), calculate the cell voltage. (b) Now calculate the cell voltage by using the reactions 2Ag+(aq)+2e-→2Ag(s) and Pb2+(aq)+2e-→Pb(s). (c) Explain that the standard reduction potential of AgCl is smaller than the standard reduction potential of Ag+. 2. (a)Explain that junction potential is one of the major errors in pH measurement. (b)Draw the line diagram of a glass combination pH electrode. (10%) 3. In which technique, atomic absorption or atomic emission, is flame temperature stability more critical? Why? (6%) 4. Explain that the fluorescence and phosphorescence come at lower energy than absorpton (the excitation energy). (6%) 5. Explain that laser induced fluorescence is a technique with very high sensitivity. (6%) 6. (a)Explain the working principle of photomultiplier. (b)The condition that photodiode would be a better detector than photomultiplier. (10%) 7. What is the major advantage of FT-IR in comparison with scanning IR? (6%) 8. Explain that deuterium lamp is used in UV but not in AA. (6%) 9. Explain that a collision cell is not often equipped with a high resolution ICP-MS. (6%) 10. What is selected reaction monitoring? Why is it also called MS/MS? Why does it improve the signal/noise ratio for a particular analyte? (15%) 11. What is the difference between a reconstructed total ion chromatogram, and extracted ion chromatogram, and a selected ion chromatogram? (15%) 12. Explain that split injection in GC provides better peak shape than splitless injection without solvent trapping. (7%) 13. Describe the two major factors which affect the resolution of a chromatogrphy separation. (6%) 14. Explain that open tubular column is often used in GC but not in HPLC. (6%) 15. 课本习题22-28 (12%) (a)Which column has more theoretical plates? (b)Which column has a larger plate height? (c)Which column gives higher resolution? (d)Which column gives a greater relative retention? (e)Which compound has a higher retention factor? (f)Which compound has a greater partition coefficient? --

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