文档介绍：原子吸收光谱仪前言 l由Alan Walsh, 于1954 年发表第一台原子吸收光谱仪( AA)。 What is What is ““AA AA" " means means lThe First “A" means : Atomic 原子的 lThe es from the “hot " ! lWe need the 火焰 or 电热 lThe Second “A" means : Absorption 吸收 l光被吸收了, we need the lamp 理论篇 Atomic Spectroscopy 理论篇 Excited states Energy Energy Ground state Excited state Atom Na Atom Fe 原子于原子化区中均是处于基态, 当受到原子线照射时, 相同元素才会提升能阶原子均有其唯一性的原子组态 Na 线 Ground state Excited state AAS 原子吸收光谱仪火焰式 ppm,sub ppb ppb 爐管式 Beer ' s Law : Absorbance, A is proportional to concentration A=log10 Io / It A = a b c, b: beam path, c = concentration I = I0 -(IAA+ B) Excited State Atom absorbs someof the incident light Ground State I0入射原子线通过原子化区之入射原子线之剩余强度原子化区理论篇 Atomic Spectroscopy 理论篇 Concentration vs Absorbance I0 B 10000 个光强 10000 个光强500 个光强 100 个光强 10 个光强 Hollow cathode lamp source Spray chamber and nebuliser Flame or graphite furnace atom cell Monochromator Processing electronics Data processing and instrument control Photomultiplier detector 火焰式石墨炉 Bandpath Atomic Spectroscopy 理论篇 A = -Log(I/I0) 空液, Blank 5ppm 10ppm Abs. I0 I Conc. Hollow cathode lamp source Spray chamber and nebuliser Flame or graphite furnace atom cell Monochromator Processing electronics Data processing and instrument control Photomultiplier detector 火焰式石墨炉 Bandpath Atomic Spectroscopy 理论篇 I III II