Font size
WorksheetsAtomic Spectroscopy (AAS, AES, AFS, Applications)
Total questions: 15
Worksheet time: 5mins
What is the temperature range at which samples are vaporized in atomic spectroscopy?
1000 - 2000
8000 - 9000 K
6000 - 8000 K
500 - 5000 K
How is the atomic concentration determined in atomic spectroscopy?
by measuring adsorption, emission, or fluorescence at a specific wavelength
by measuring absorption, emission, or fluorescence at specific wavelength
by measuring emission & fluorescence at specific frequency
by measuring absorption, emission or sensitivity at specific frequency
What are the units commonly used to express the concentration in atomic spectroscopy?
ppb
ppt
ppm
pph
What is the typical precision of atomic spectroscopy?
5 - 10%
4 - 5%
1 - 2%
10 - 15%
What is the purpose of Atomic Absorption Spectroscopy (AAS)?
quantitatively determine the concentration of chemical elements in a sample by measuring the absorption of radiation (light) by free atoms in the liquid phase
quantitatively determine the concentration of measurable elements in a sample by measuring the adsorption of radiation (light) by dormant atoms in gaseous state
quantitatively determine the mol number of elements in a sample by measuring the adsorption of radiation (light) by atoms on gaseous state
quantitatively determine the concentration of chemical elements in a sample by measuring the absorption of radiation (light) by free atoms in the gaseous state
What are the advantages of using AAS compared to other methods?
Simple
High Operator Involvement
Greater precision
Low Operating Cost
A = k * C
What is A
Absorbance
Angstrom
Atom
Desired Element
What are some background correction methods used in AAS to avoid significant errors?
Deuterium Lamp
Board Chopping
Zaiman Effect
Smith-Hieftje
What is Plasma in AES based on Plasma Source?
liquid, cold enough to contain ions and free electrons
gas, hot enough to contain ions and free electrons
gas, hot enough to contain ions and free photons
liquid, hot enough to contain ions and free electrons
Which one shows illustration for Atomic Emission Spectroscopy?
What are the advantages of AES?
Lower susceptibility to chemical interferences
Lower susceptibility to spectral interferences
Good emission spectra
Energetic ion source
Atomic Fluorescence Spectroscopy (AFS) is combination of AAS and AES.
What is the part from AES that is also applied in AFS?
excitation from ground state to lower state
measurement by detection of radiation emitted by atoms
excitation from ground state to upper state
measurement by detection of radiation emitted by flame
In AFS, atoms are primarily excited by radiation from light source, which is the same as....
AAS
AES
Below are the applications of atomic spectroscopy, EXCEPT....
laboratories
education
sampling for heavy-metal contaminations
pharmaceutical
Is atomic spectroscopy highly sensitive?
Yes
No
