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您所在的位置:> 儀器網 > 技術中心 > 解決方案 > 原子吸收光譜儀靈敏度低的原因簡介

原子吸收光譜儀靈敏度低的原因簡介

2021年03月10日 16:56人氣:1668

  【儀器網 解決方案】原子吸收光譜儀是一種十分常見的精密儀器,其基本原理是從光源輻射出具有待測元素特征譜線的光,通過試樣蒸氣時被蒸氣中待測元素基態原子所吸收,由輻射特征譜線光被減弱的程度來測定試樣中待測元素的含量。
 
  原子吸收光譜儀具有快速準確、精度高、操作簡單及選擇性好等特點,廣泛應用于冶金、地質、采礦、石油、輕工、農業以及醫藥等領域的元素分析。想要獲得準確的分析結果,不僅需要正確使用該儀器,還需要及時對常見故障進行排除。
 
  靈敏度低的主要原因及處理方法:
 
  1、可能原因:燃燒縫偏離光軸
 
  解決方法:將一張白色濾紙放在燃燒頭的上方,觀察光斑是否在燃燒縫正上方,若不是,先上下左右調節燈的位置使燈的能量棒大,點火狀態下,吸入銅標準溶液,前后左右、上下調節燃燒頭的位置,使其吸光度大。
 
  2、可能原因:毛細管、霧化器金屬內管被堵,致使試液提升量不足。
 
  解決方法:用0.5毫米內徑毛細管吸入10毫升蒸餾水,正常值應大于4ml/min,若低于4ml/min,取下毛細管、霧化器,再用儀器附帶的清洗探針疏通毛細管和霧化器金屬內管。
 
  3、可能原因:撞氣球位置不當,霧化效率下降。
 
  解決方法:可做霧化率實驗來判斷,用1+1的鹽酸清洗撞氣球,前后調節撞氣球的位置,使銅標準溶液吸光度大。
 
  4、可能原因:燃燒器狹縫兩端被堵,不僅使有效光程變短,而且使試液提升量和霧化效率降低。
 
  解決方法:觀察火焰形狀(正常為魚尾形),無斷焰和鋸齒狀,用名片紙清通燃燒縫或取下燃燒頭,用1+1鹽酸清洗燃燒縫。
 
  5、可能原因:燈電流設置過大,致使測量靈敏度降低。
 
  解決方法:改變燈電流的設置,保持光源有足夠的強度,并在穩定發射的條件下,盡量減少燈電流。如果空心陰極燈老化變質,靈敏度下降,則應該更換新燈。
 
  6、可能原因:光譜帶選擇過寬。
 
  解決方法:調節狹縫寬度,光譜帶狹縫越小,靈敏度越高。
 
  7、可能原因:助燃氣量比不適當。
 
  解決方法:根據待測元素的特性,選擇相應的火焰類型,富焰型或貧焰型,選擇合適的燃氣比。
 
  8、可能原因:環境溫度太低,噴霧器無法正常工作。
 
  解決方法:環境溫度應該在10-30℃之間,低不得低于5℃,當溫度低于5℃時,低溫高速氣體將使水樣無法霧化,甚至凝結成小冰粒??蛇m當提高室內溫度。
(本文來源: 儀器網 ,轉載請注明出處

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賽默飛 德國IKA
第7屆廣州國際生物技術大會暨展覽會
第7屆廣州國際生物技術大會暨展覽會

時間:2022.09.15~2022.09.17 地點:廣州·廣交會展館C區


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