2.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.The purpose of the ashing step in graphite-furnace atomic-absorption spectroscopy 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.
4.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
1.A hollow cathode lamp produces light emission that is characteristic of the atomic species in the lamp. Atomic absorption and emission linewidths are inherently narrow.
2.Atomic absorption spectroscopy requires gas-phase atoms in their ground state. Excitation and ionization of the analyte does occur in high-temperature flames, and reduces the amount of absorption from the analyte atoms.
3.Since molecules have broad absorption bands, they can interfere by absorbing at the wavelength of the element being analyzed.
4.Since the sample is loaded directly into the furnace, none is lost in nebulizing as in a flame AA.
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