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原子吸收分光光度計(jì)工作原理和參數(shù)

時(shí)間:2011/10/18閱讀:1464
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原子吸收分光光度計(jì)工作原理和技術(shù)參數(shù),原子吸收光譜法是依椐處于氣態(tài)的被測(cè)元素基態(tài)原子對(duì)該元素的原子共振輻射有強(qiáng)烈的吸收作用而建立的。該法具有檢出限低(火熖法可達(dá)ng?cm–3級(jí))準(zhǔn)確度高(火熖法相對(duì)誤差小于1%),選擇性好(即干擾少)分析速度快等優(yōu)點(diǎn)。 在溫度吸收光程,進(jìn)樣方式等實(shí)驗(yàn)條件固定時(shí),樣品產(chǎn)生的待測(cè)元素相基態(tài)原子對(duì)作為銳線光源的該元素的空心陰極燈所輻射的單色光產(chǎn)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(shù)。據(jù)此,通過(guò)測(cè)量標(biāo)準(zhǔn)溶液及未知溶液的吸光度,又巳知標(biāo)準(zhǔn)溶液濃度,可作標(biāo)準(zhǔn)曲線,求得未知液中待測(cè)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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