MET E 222-Quiz 4

Which of the following is not under instrumental analysis?

• XRF

• AAS

• Fire Assay

AAS stands for _______________.

• Atomic Absorption Spectroscopy

• Atomic Analysis Spectroscopy

• Analytic Absorption Spectroscopy

This instrumental analysis technique uses the principle that free atoms (gas) generated in an atomizer can absorb radiation at specific frequency, therefore elements content can be quantified

• XRF

• AAS

• XRD

What happens when samples are exposed to plasma energy?

• Atoms are excited then emit rays once they return to ground state

• Atoms are dissolved enabling quantification of elements

• Atoms are absorbed and then analyzed

True or False: In AAS, there is one uniform lamp which must be used for all elements

• True

• False

Who is the father of XRF Technique?

• Henry Mosely

• Georgius Agricola

• Herbert Hoover

This uses electron beam of high energy to excite the atoms causing to the ejection of photoelectrons from the inner shells making up the material and leaving a hole which will then be filled up by other electrons from a higher energy shell.

• XRF

• AAS

• ICP-OES

This technique is based on the principle that individual atoms, when excited by an external energy source, emit X-ray photons of a characteristic energy or wavelength. By counting the number of photons of each energy emitted from a sample, the elements present may be identified and quantified

• XRF

• AAS

• ICP-OES

Which of the following statement is not true

• XRF analyzes sample elemental composition and content while XRD determines the sample’s mineralogy

• XRD is used to determine the atomic arrangement of a sample

• Samples subject to XRD test is prepared in solution

Which of the following is/are true about AAS and ICP?

• AAS relies upon an atomic absorption process while ICP is an atomic/ionic emission spectroscopic technique

• The two have difference in method of atomization. AAS uses combustion flame or graphite furnace while ICP-ES uses plasma.

• AAS and ICP provides accurate analysis for all elements