CHM260 AAS

Which of the following is NOT considered a species examined in atomic spectroscopy?

• Atoms

• Molecules

• Ions

• Gaseous metal atoms

What characteristic is unique to each element in atomic spectroscopy?

• Its mass number

• Its characteristic spectrum

• Its atomic radius

• Its electronegativity value

In Flame Atomic Absorption Spectroscopy (AAS), what happens to a valence electron when an atom is heated strongly in a flame?

• It falls to a lower energy orbital.

• It forms a covalent bond with another atom.

• It becomes ionized.

• It is excited to a higher-energy orbital.

What is the primary purpose of the atomization process in atomic spectroscopy?

• To form molecular ions for mass spectrometry.

• To convert the sample into a solid precipitate.

• To convert the sample to an atomic vapor.

• To dissolve the sample in a suitable solvent.

Which type of atomizer typically operates at the highest temperature?

• Flame

• Electrothermal vaporization (ETV)

• Inductively coupled argon plasma (ICP)

• Microwave-induced argon plasma (MIP)

Select the following sequence of components in the CORRECT order for atomic emission spectroscopy (AES)

• Nebulizer, Source, sample, burner, monochromator, detector, computer readout

• Burner, nebulizer, monochromator, detector, computer readout

• Burner, nebulizer, monochromator, computer, detector readout

• Nebulizer, burner, monochromator, detector, computer readout

Which region of the flame is considered the hottest part and best for atomic absorption?

• Primary combustion zone

• Secondary combustion zone

• Interzonal region

• Pre-combustion zone

What is the main function of a nebulizer in Flame AAS?

• To heat the sample to a high temperature.

• To convert the liquid sample to a fine spray.

• To detect the absorbed radiation.

• To separate different elements in the sample.

Which type of burner is characterized by the nebulizer and burner being combined into a single unit, leading to a relatively short path length through the flame?

• Laminar flow burner

• Premix burner

• Total consumption burner

• Slotted burner

Classify the type of interference involved in the analysis when two or more elements have emission spectra in adjacent or overlapping wavelengths.

• Self-absorption

• Chemical Interference

• Ionization Interference

• Spectral Interference