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Chemical Composition Evaluation

Dr. Dmitri Kopeliovich

Spectrometry is an analytical technique used in chemistry for quantitative and qualitative analysis of substances by means studying the electromagnetic spectra either absorbing (absorbtion spectroscopy) or radiating (emission spectroscopy) by the substance.

Spark or arc spectroscopy is a method of metals and alloys analysis, using an electric spark (or arc) passing through the metal sample, heating its surface and causing emission of light by the excited atoms of the sample.

The waves of the emitted light are analyzed by spectroscopic methods.

X-Ray Fluorescence (XRF, X-Ray Emission) Spectroscopy is an analytical non-destructive spectral method, using irradiation of the sample by intensive x-rays, causing emission of fluorescent x-rays by the sample atoms.

The emitted x-rays are detected and analyzed by a spectrometer.

The qualitative analysis is based on either wavelength or energies of the emitted x-rays.

The quantities of the sample components are determined by intensities of the emitted x-rays.

Atomic absorption is a destructive analytical method where a light of a definite wavelength is passed through the atomized sample.

The waves transmitted by the sample are analyzed as compared to the waves passed through the sample. Thus the energy, absorbed by the sample is determined.

The amount of the absorbed energy is related to the concentration of the certain component.


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chemical_composition_evaluation.txt · Last modified: 2014/05/03 by dmitri_kopeliovich
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