單項選擇題One of the main advantages of a graphite-furnace atomizer is that（）

A.It requires only very small quantities of a sample
B.It requires metal.ions in aqueous solution
C.It does not produce background emission like a flame
D.It does not get hot like a flame


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1.單項選擇題The purpose of the ashing step in graphite-furnace atomic-absorption spec-troscopy is to（）

A.Vaporize metal atoms to be analyzed
B.Cause the metal species to form carbides which are more volatile
C.Convert the graphite furnace to ash to avoid carbide formation
D.Burn off organic species that would interfere with the elemental analysis

2.單項選擇題The purpose of the flame in flame atomic-absorption spectroscopy is to（）

A.Purify the sample
B.Desolvate and atomize the analyte atoms in a sample
C.Excite the analyte atoms
D.Ionize the analyte atoms

3.單項選擇題A hollow-cathode lamp is（）

A.A broad-band light source
B.A narrow-band light source
C.A light detector
D.Not a light source

4.單項選擇題可提高Al元素的原子化效率的方法是（）

A.加快噴霧速度
B.降低火焰溫度
C.在待測溶液中加入消電離劑
D.用石墨爐原子化器代替火焰原子化器

5.單項選擇題原子吸收光譜為線光譜，一般分布在下列哪個光區(qū)（）

A.遠紫外
B.紫外可見
C.紅外
D.遠紅外