Atomic Emission Spectroscopy Flashcards
These are thermally excited so that they emit light
Atoms
The radiation emitted by atoms are ______________
measured
Another name for atomic emission spectroscopy
Flame photometry
Atomic emission spectroscopy is also called
Optical emission spectroscopy (OES)
[TRUE/FALSE] Emitted light can be viewed through a spectroscope to produce a line emission spectrum
TRUE
A series of colored lines on a dark background
Line emission spectrum
[TRUE/FALSE] The line emission (atomic) spectrum of an element is always similar to one another.
FALSE, it is unique.
Common elements with emission lines
CaBaNaLiK
- calcium, barium, sodium, lithium, potassium
The sample passes through these materials during instrumentation
Flame, monochromator/filter, detector
Sample containing the metal is volatilised in what type of flame? At what degrees?
natural gas / compressed air flame at 2000 degrees C
A higher temperature flame reaches what degrees?
2500 degrees C
A higher degree flame (2000 deg. C) may be obtained using what type of flame?
Air / acetylene
A higher temperature (2500 deg C) is required for the analysis of what element?
Mg by AES
In more expensive instruments, the radiation emitted by the excited atoms passes through what?
Filter or monochromator
As the emitted radiation passes through this, a narrow band of radiation is selected and interfering sources of radiation in the sample are screened out
Filter or monochromator
What are some examples of interfering sources of radiation?
Flame and other components
The intensity of the selected radiation is measured by a detector using what type of cell?
Photosensitive cell
Interference that may reduce the observed emission from the sample
Ionization
Interference that can either increase or decrease the rate at which the sample is drawn into the flame relative to the standard solution
Viscosity
Interference that gives a false high or low reading
Viscosity
Anions form what type of salts with metal ions?
Involatile salts
[TRUE / FALSE] Anions reduce the reading of the sample solution.
TRUE
Examples of anions
Sulphate and phosphate
Quantification of alkali metals in
alkali metal salts, infusion and dialysis solutions
Application of AES in pharmaceutical analysis includes
- quantification of alkali metals in alkali metal salts, infusion and dialysis solutions
- determination of metallic impurities in some of the other inorganic salts used in preparing these solutions
Provides a robust, cheap, and selective method based on relatively simple instrumentation for quantitative analysis of some metals
Strength
Only applicable to the determination of alkali and some alkaline earth metals
Limitation of AES
ICP-AES stands for
Inductively-Coupled Plasma Atomic Emission Spectroscopy
[TRUE / FALSE] If high enough temperatures can be reached, only some elements can be excited to a level where it will produce emission of radiation
FALSE, any element
High temperatures can be achieved by using __________
plasma emission
Heating argon with high intensity RF radiation
Plasma emission
Provides rapid analysis of active ingredients due to its high sensitivity and specificity which is advantageous during formulation development
ICP-AES
