Two-channel screening unit of atgomizer for atomic fluorescence spectrometry

摘要

the invention relates to a new structure of double duct shielding units (1) '. flame in gas - shield atomizu00e1toru pouzu00edvanu00e9ho to tekavu00fdch speciu00ed atomization atomic fluorescencnu00ed spectrometry.device according to the invention consists of the internal component (2), a masking unit, the middle part (3), a masking unit and vnejsu00edho component (4), a masking unitwhile allowing a space between the internal (2) and the middle part (3), a masking unit (1) creates the inner channel and the space between the middle (3) and vnejsu00edm part (2) a masking unit (1) creates a vnejsu00ed channel.in both channel is separate pru00edvody vhu00e1nen shielding gas (5, 6) that creates a two koncentricku00e9 currents stu00ednicu00edho gas around the mikroplamu00ednku flame in gas - shield atomizu00e1toru.the whole assembly shielding unit (1) is just mounted on a vertical kremennou tube (7) privu00e1deju00edcu00ed tekavu00e9 specie (8) of the analyte.the advantage of this screening unit (1) in comparison with previously pouzu00edvanu00fdmi designs is minimisation of and redenu00ed atom inside observation volume atomizu00e1toru,as in zabru00e1nenu00ed pruniku molecular oxygen from the surrounding atmosphere. this leads to improve the sensitivity and presnosti analytical procedure to generate tekavu00fdch zalozenu00e9ho speciu00ed for afs.