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原子吸收分光光度計工作原理和參數

時間:2011/10/18閱讀:1503
分享:
原子吸收分光光度計工作原理和技術參數,,原子吸收光譜法是依椐處于氣態(tài)的被測元素基態(tài)原子對該元素的原子共振輻射有強烈的吸收作用而建立的,。該法具有檢出限低(火熖法可達ng?cm–3級)準確度高(火熖法相對誤差小于1%),,選擇性好(即干擾少)分析速度快等優(yōu)點,。 在溫度吸收光程,,進樣方式等實驗條件固定時,,樣品產生的待測元素相基態(tài)原子對作為銳線光源的該元素的空心陰極燈所輻射的單色光產生吸收,,其吸光度(A)與樣品中該元素的濃度(C)成正比。即 A=KC 式中,K為常數,。據此,,通過測量標準溶液及未知溶液的吸光度,又巳知標準溶液濃度,,可作標準曲線,,求得未知液中待測元素濃度。 該法主要適用樣品中微量及痕量組分分析,。 

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