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Home Georgian Technologies Atom-Absorption Spectrometer with Flame Atomizer

Atom-Absorption Spectrometer with Flame Atomizer

Description

Development of flame Atom-Absorption spectrometer (AAS) with modulation of atom concentrations of the investigated element in the absorption area is suggested. The solution, which is to be analyzed, is injected gradually by the atomizer of original construction. The flame is even during the injection. When the atom concentration is at its maximum in the absorption area, the signal is sent to the main channel (basic signal), when that is at the minimum, the signal goes to the comparative channel (comparative signal). Finally, the comparative signal is subtracted from the basic one.

Innovative Aspect and Main Advantages

There are preserved all the advantages of single-beam AAS:
a) a simple optical system;
b) low cost;
c) high relative intensity of primary radiation and the low influence of flame self radiation.

All the advantages of double-beam AAS are preserved.

  1. There is efficiently cancelled the noise caused by:
    a) the fluctuations in the primary radiation intensity;
    b) the fluctuations in the sensitivity of the photo-detector and the amplifier and the fluctuations in the optical system;
  2. The time, which is necessary for lamp heat (stabilization) is decreased importantly (the primary light source). Besides it has the following advantages in comparison with the double-beam spectrometers.
  3. The noise caused by the atomizer. Self-radiation is cancelled efficiently.
  4. The noise caused by non-stationary character of nonselective absorption of the primary radiation in the atomizer is cancelled. That’s why the detection limit of elements, which resonance line is absorbed in flame, is improved abruptly (e. g. elements which resonance lines are near 200 nm.).
  5. It is possible to measure directly the small difference between the concentrations of the element in two solutions at their simultaneous or sequential dispersion.
  6. The system allows measuring the portion (concentration) of the element (some elements) being in a particular valence state in its total content.
  7. The system enables one to study the effect of different substances on the signal of atomic absorption of the element both before its dispersion and after its dispersion, i.e. in the aerosol phase and after the aerosol phase i.e. in flame.
  8. It is possible to study the dependence of the atomic absorption signal on the time of action of the reagent on the element to be measured in the aerosol phase.

As a result, the detection limit (sensitivity) and the accuracy of the AA measurements improve abruptly. The spectrometer allows to use both flame atomizers, based on the methods of cold vapor and hydride. Further pulse atomizers could be designed for the spectrometer.

Areas of Application

The spectrometer is designed for the use in analytical laboratories for both fundamental and applied investigations. Applications include biology, medicine, environment protection, chemistry, physics, biotechnology, agronomy etc.

Creation of the spectrometer offered may be used for the commercial production of competitive, high sensitive, simple and cheap AA spectrometers.

The system offered can be installed in the commercial AA spectrometers as one of operational modes, which will improve their analytical characteristics and competitiveness.

The system offered may be used in available spectrometers after their reconstruction, which is also of commercial importance.

 

 

 

Fig. 1. Block diagram of
spectrometer:
1. Source of light; 2. Flame atomizator;
3.Monochromator; 4. Photo detector;
5. Amplifier; 6. Multiplexing block;
7. Signal subtraction block;
8. Signal measuring block;
9. Control block;
10. Block of atoms concentration modulation
.


Stage of Development

The atomizer scheme with a new construction and the corresponding scheme of AA spectrometer are created.

Contact Details

Andronikashvili Institute of Physics
6 Tamarashvili St. 0177 Tbilisi, Georgia
Contact person: Dr. Alexsander Rcheulishvili
Tel (+ 995 32) 39 8783
Fax : (+995 32) 39 1494
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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