Food (physical and chemical) testing

This standard specifies the hydride atomic fluorescence spectrometry, fluorescence spectrophotometry, and inductively coupled plasma atomic harmonic method for the determination of selenium content in food. This standard is applicable to the determination of selenium in various foods. Method 1: Hydride Atomic Fluorescence Spectroscopy Principle 2: After the sample is digested by acid heating, the hexavalent selenium in the sample is reduced to tetravalent selenium in 6 mol/L hydrochloric acid medium. Sodium borohydride or potassium borohydride is used as a reducing agent to reduce the tetravalent selenium to hydrogen selenide in hydrochloric acid medium. The carrier gas (argon gas) is brought into the atomizer for atomization. Under the irradiation of a selenium hollow cathode lamp, the ground state selenium atom is excited to a high-energy state, and upon deactivation, it returns to the ground state, Emitting fluorescence of characteristic wavelengths, the fluorescence intensity is proportional to the selenium content and quantitatively compared to the standard series

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