複選題

5. Which of the following test are used for determine system error in experiment?
(A) Blank test.
(B) Duplicate test.
(C) Standard reference material test.
(D) Standard addition recover test.

(E) Blind sample test.

1. Derivatization reactions are often used in preparation samples for chromatographic separation, which of the following statements are not the major purposes of these reaction?(A) Increasing the detection sensitivity.(B) Increasing separation resolution for chiral compounds.(C) Increasing the application range of chromatographic analysis.(D) Decreasing the analytes reaction with the separation column.(E) Decreasing the retention time of analytes.

2. Which of the following gas chromatographic detectors are nondestructive types?(A) Flame ionization detector.(B) Flame photometric detector.(C) Thermo-conductance detector.(D) Nitrogen phosphor detector.(E) Mass spectrometry detector.

複選題3. What kinds of ionic sources are commonly used in time of flight mass spectrometer?(A) Electron impact.(B) Field desorption.(C) Electro-spray ionization.(D) Matrix assisted laser desorption/ionization.(E) Fast atom bombardment secondary ionization.

4. Which of the following experiment procedures are commonly used as sample pre-treatment method for determine inorganic compounds in sample?(A) Solid phase extraction.(B) Acid digestion.(C) Microwave extraction.(D) Pressurized solvent extraction.(E) Purge and trap.

6. Which of the following UV/Vis radiation transducer is the most sensitive one?(A) CdS photoconductivity cell.(B) GaAs photovoltaic cell.(C) Photomultiplier tube.(D) Silicon photodiode.(E) CdSe photoconductivity cell.

7. Corrected retention times for ethyl, n-propyl and n-butyl alcohols on a column are 0.69, 1.51, and 3.57 minutes respectively. Predict retention times for the next two members of the homologous series.(A) 7.20 and 15.88 minuses.(B) 8.00 and 18.20 minuses.(C) 5.67 and 14.36 minuses.(D) 6.54 and 13.78 minuses.(E) 8.99 and 17.56 minuses.

複選題8. Which of the following factors can result in line broaden for an atom emission line width?(A) Collision between atom and other species in measurement system.(B) The lifetime of the atomic transition states are finite, usually the lifetime of ground state is longer the lifetime of excited state.(C) The direction of the fast moving atom, toward to or receding from a radiation transducer in measurement system.(D) Solvent type used for dissolving sample.(E) Types of energy source for excitation atom in measurement system.

9. Which of the following is/are not the sources of an instrument noise?(A) Shot noise.(B) Flicker noise.(C) Chemical noise.(D) Environmental noise.(E) Thermal noise.

10. Which of the following spectrometers usually requires very high resolution and more expensive optical equipment (monochromator) due to their highly complex spectrum lines?(A) Induced coupled plasma atomic emission spectrometer.(B) Flam fluoresces atomic spectrometer.(C) Electro thermal atomic absorption spectrometer.(D) Fourier transforms IR spectrometer.(E) Spark source atomic spectrometer.

11. A gas chromatographic column was used to separate a pair of compounds. The retention times for these two compounds were 11.56 minutes and 11.71 minutes respectively. If the dead time for mobile phase was 1.60 minutes and the theoretic plate height (HETP) was 0.28 mm under the separation condition, what is the column length (in meter) and peak width (in seconds) for these compounds should be when they need to be just totally resolved? Give the equation: (A) ~80 m and ~6 s.(B) ~70 m and ~8 s.(C) ~50 m and ~7 s.(D) ~60 m and ~6 s.(E) ~50 m and ~8.0 s.