单项选择题

A1型题 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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单项选择题

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

单项选择题

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