Determination of selenium by AFS9 series of Yoshida atomic fluorescence spectrometry.

Determination of Selenium by AFS9 Series Atomic Fluorescence Spectrometry in Yoshida

Atomic absorption spectrometry (AAS) determines the content of elements in a sample according to the absorption intensity of ground-state atoms of elements in vapor phase to their atomic resonance radiation.

Its advantages and disadvantages:

& lt 1 & gt； Low detection limit and high sensitivity. The detection limit of flame atomic absorption spectrometry can reach ppb level, and that of graphite furnace atomic absorption spectrometry can reach10-10-10-14g.

The accuracy of<2> analysis is good. The relative standard deviation of high content elements in flame atomic absorption spectrometry can be as follows

& lt3> analysis speed is fast. Atomic absorption spectrometer can continuously determine 6 elements in 50 samples within 35 minutes.

& lt4> has a wide range of applications. Indirect atomic absorption spectrometry can determine more than 70 elements, not only metallic elements, but also nonmetallic elements and organic compounds.

& lt5> This instrument is simple and easy to operate.

The disadvantage of<6> atomic absorption spectrometry is that it is still difficult to determine many elements at the same time, and the determination sensitivity of a considerable number of elements is not satisfactory.

Atomic emission spectrometry (AES) is a method to analyze the elements to be measured according to the characteristic spectral lines emitted by the excited atoms of the elements to be measured when they return to the ground state.