Table of Contents
- 1 Why is atomic emission more sensitive to flame instability than atomic absorption or atomic fluorescence?
- 2 Why is AES more sensitive than AAS?
- 3 Why is an electrothermal atomizer more sensitive than a flame atomizer?
- 4 Why a stable flame is very important during atomic emission analysis?
- 5 What is the difference between flame atomic absorption and flame atomic emission?
- 6 Why fluorescence is more sensitive than absorption?
Why is atomic emission more sensitive to flame instability than atomic absorption or atomic fluorescence?
Why is atomic emission more sensitive to flame instability than atomic absorption or fluorescence? The population of excited atoms from which emission arises is very sensitive to the flame temperature and other conditions.
Why is flame temperature stability more important in atomic emissions than atomic absorption?
In which technique, atomic absorption or atomic emission is flame temperature stability more critical? Why? It is more critical for atomic emission because the emission flux is depends on the flame temperature, while the atomization, which affects both methods, is less dependent on temperature. 2.
Why is AES more sensitive than AAS?
AAS is a relative method, i.e. the quantitative analysis of the element of interest in the sample, is carried out by comparison with standard solutions. Because far more atoms are configured in the ground state (of every detectable material?), this method is considerably more sensitive in detecting elements than AES .
Is emission or absorption more sensitive?
The detectors used in studying the absorption of radiation are inherently more sensitive than those used to study emission. Materials used in the construction of absorption instruments produce higher flame temperatures than instruments designed for emission.
Why is an electrothermal atomizer more sensitive than a flame atomizer?
Why is an electrothermal atomizer more sensitive than a flame atomizer? The electrothermal atomizer is a more efficient atomizer. It requires much less sample, uses a larger fraction of the sample, and keeps the atomic vapor in the beam for a longer time than does a flame.
Why are spectral interferences less severe in atomic absorption than in flame emission spectroscopy?
29. Skoog 10-8: Ionization interferences are less severe in the ICP than in flame emission because argon plasmas have a high concentration of electrons (from ionization of the argon) which represses ionization of the analyte. Emission spectra for many elements can be obtained with one set of excitation conditions.
Why a stable flame is very important during atomic emission analysis?
A stable flame minimizes uncertainty due to fluctuations in the flame. This is important because two competing processes affect the concentration of free atoms in the flame. The more time the analyte spends in the flame the greater the atomization efficiency; thus, the production of free atoms increases with height.
What is the role of the flame in atomic absorption spectroscopy?
The flame converts samples into free ground state atoms that can be excited. A lamp emitting light at a wavelength specific to the atoms is passed through the flame, and as the light energy is absorbed, the electrons in the atoms are elevated to an excited state.
What is the difference between flame atomic absorption and flame atomic emission?
The key difference between flame emission spectroscopy and atomic absorption spectroscopy is that during flame emission spectroscopy, certain wavelengths are emitted from atoms, whereas during atomic absorption spectroscopy, certain wavelengths are absorbed by atoms.
Why is AAS sensitive?
As a method of detection, it is incredibly sensitive, measuring at parts per million (ppm) It can analyse specific elements because of the unique light-absorbent qualities of their atoms. AAS can determine concentrations of over 65 elements.
Why fluorescence is more sensitive than absorption?
The reason why fluorescence is more sensitive than UV-Vis absorption is that they are measured in different ways. Absorbance is measured as the difference in intensity between light passing through the reference and the sample, whereas fluorescence is measured directly without any reference beam.
Why fluorescence spectroscopy is more sensitive than absorption techniques?
Fluorescence is more sensitive because of the different ways of measuring absorbance and fluorescence. This advantage is due to measurement of the fluorescence relative to a dark background, as compared to the bright reference beam in an absorbance meas-urement.