Atomic Fluorescence Spectrometer
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Atomic Fluorescence Spectrometer
Methods of qualitative and quantitative analysis of material line by using atomic fluorescence wavelength and intensity.
Working principle:
Using potassium borohydride or sodium borohydride as a reducing agent, will restore to be analyzed elements in the sample solution for volatile covalent gaseous hydride (or atomic vapor), then with the help of the carrier gas into the atomizer, atoms in argon hydrogen flames and the formation of a ground state atom. Into the ground state to the excited state absorption of light energy, the excited atom in the activation process to absorb the energy released by fluorescence form, content of the fluorescence signal intensity and the sample is a linear relationship between the content of elements, so by measuring the fluorescence intensity can be measured to determine the elements in a sample.
Fluorescent type:
A) resonance fluorescence -- Atomic Absorption of inverse process, energy absorption and release of energy equivalent. E=hv=hc/ lambda
B) non resonance fluorescence, energy is not equal, the non resonance fluorescence line
Fluorescence quenching, using argon as carrier gas and shielding gas, argon effect:
The carrier gas (a) gas: including hydride vapor, hydrogen generated)
The shielding gas (b) to prevent oxidation, inhibition of hydride atomic fluorescence quenching, stable environment.
Advantage:
1 non dispersive system, short optical path length, less energy loss
2 has the advantages of simple structure, low failure rate
3 high sensitivity, low detection limit, and excitation light intensity is proportional to
4 receive a plurality of fluorescence spectra
5 suitable for multi elemental analysis
6 the day blind detector, decrease the flame noise
7 wide linear range, 3 orders of magnitude
8 atomization efficiency high, theoretically could reach 100%
9 no matrix interference
Analysis of 10 to do valence
11 the use of argon, low operation cost
12 using the argon hydrogen flame, strong ultraviolet transmittance, low background noise
Methods:
Material absorption of electromagnetic radiation by excited, excited atoms or molecules to activation by radiation, re emission and excitation wavelength radiation wavelength of the same or different radiation. When the excitation light source to stop the sample after irradiation, and then fired process stop immediately, the re launched as the fluorescent light; if the excitation light source to stop the sample after irradiation, and then fired a long time process continued, the re emission of light is called phosphorescence. Fluorescence and phosphorescence are photoluminescence. Analysis method has a very high sensitivity atomic fluorescence spectroscopy, the linear range of calibration curve width, capable of simultaneous determination of multi elements of. These advantages make it widely used in many fields of geology, metallurgy, the petroleum, agriculture, biomedicine, geochemistry, material science, environmental science.
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