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WorksheetsAtomic Absorption Spectrometer
Total questions: 10
Worksheet time: 30mins
Select the process occuring during atomization (>1answer)
desolvation
nebulization
combustion
volatilization
Common radiation source for line source used in AAS (> 1answer).
Spark or arc ablation
Hollow cathode lamp (HCL)
Electrodeless discharge lamp (EDL)
Interference is the presence of substance that changes the signal from the analyte of interest when analytes concentration remain the same. List 3 interferences in AAS.
Ionization interference
Spectral interference
Refractory compound interference
Fundamental interference
What is spectral interference?
light scattering of solid particles
some ions will be produced in hot flames
alteration in analyte absorbance caused by chemical processes during atomization
Methods to overcome the spectral interference.
Background correction
Tune the monochromator to a different spectral line for the element of interest so that there is no overlap.
Adding lanthanum chloride (LaCl3) to samples, standards and blank
Methods to prevent refractory interferences.
Add ionization suppressor
Add chelating agents such as EDTA.
Use a higher flame temperature.
Formation of compounds between the metal and other components in flame. Choose the correct interference.
Spectral interference
Ionization interference
Refractory interference
What type of spectroscopy is AAS?
Molecular spectroscopy
Atomic spectroscopy
Ion spectroscopy
Emission spectroscopy
What type of samples can be analyzed with an AAS?
Solid
Liquid
Colloid
Suspension
Select the fuel gas used in AAS. (>1answer)
Propane
Acetylene
Hydrogen
Air
