基于水溶液中金屬元素檢測的超聲波霧化輔助SIBS技術(shù)研究
發(fā)布時間：2018-11-23 10:35
【摘要】：為了建立一套高靈敏和低成本的液體樣品金屬元素檢測分析方法,設(shè)計制造了一套超聲波霧化輔助電火花擊穿光譜(UN-SIBS)的實驗系統(tǒng)。利用超聲波霧化裝置將液體樣品轉(zhuǎn)化為密集小液滴組成的氣溶膠,并使用高壓放電線圈和銅電極擊穿氣溶膠樣品誘導(dǎo)等離子體,通過采集分析光譜信號實現(xiàn)對樣品金屬成分的分析。實驗研究了該方法的發(fā)射光譜譜線特性,對等離子體的電子溫度和密度等物理特性參數(shù)進行了計算分析。針對含有不同濃度重金屬鉛(Pb)元素的樣品,在較大的濃度范圍內(nèi)繪制了Pb元素261.37nm處的原子峰強度隨質(zhì)量濃度變化的曲線。實驗結(jié)果顯示,UN-LIBS方法對Pb元素檢測限不高于2.07ppt,優(yōu)于同類方法所報道的檢測限。同時,與金屬活性相對較低的鈣(Ca)元素SIBS檢測結(jié)果進行了比較,分析了UN-SIBS方法的相關(guān)機理。
[Abstract]:In order to establish a high sensitivity and low cost method for the detection and analysis of metallic elements in liquid samples, an experimental system of ultrasonic atomization assisted electrical spark breakdown spectroscopy (UN-SIBS) was designed and manufactured. The liquid sample was transformed into aerosol composed of dense droplets by ultrasonic atomization device, and the plasma was induced by using high-pressure discharge coil and copper electrode to break through the aerosol sample. The metal composition of the sample is analyzed by collecting and analyzing the spectral signals. The emission spectrum line characteristics of the method are experimentally studied and the physical parameters such as electron temperature and density of the plasma are calculated and analyzed. For the samples containing (Pb) with different concentrations of heavy metal lead, the curve of atomic peak strength at 261.37nm of Pb element with mass concentration was plotted in a large concentration range. The experimental results show that the detection limit of Pb element by UN-LIBS method is less than 2.07 ppt, which is better than the detection limit reported by the same method. At the same time, compared with the results of SIBS detection of calcium (Ca) element with relatively low metal activity, the related mechanism of UN-SIBS method was analyzed.
【作者單位】： 青島大學(xué)物理科學(xué)學(xué)院;山東省高校光子學(xué)材料與技術(shù)重點實驗室(青島大學(xué));中國海洋大學(xué)光學(xué)光電子實驗室;
【基金】：國家自然科學(xué)基金青年基金項目(11104153) 青島市應(yīng)用研究項目(2015125)資助
【分類號】：O657
本文編號：2351282
[Abstract]:In order to establish a high sensitivity and low cost method for the detection and analysis of metallic elements in liquid samples, an experimental system of ultrasonic atomization assisted electrical spark breakdown spectroscopy (UN-SIBS) was designed and manufactured. The liquid sample was transformed into aerosol composed of dense droplets by ultrasonic atomization device, and the plasma was induced by using high-pressure discharge coil and copper electrode to break through the aerosol sample. The metal composition of the sample is analyzed by collecting and analyzing the spectral signals. The emission spectrum line characteristics of the method are experimentally studied and the physical parameters such as electron temperature and density of the plasma are calculated and analyzed. For the samples containing (Pb) with different concentrations of heavy metal lead, the curve of atomic peak strength at 261.37nm of Pb element with mass concentration was plotted in a large concentration range. The experimental results show that the detection limit of Pb element by UN-LIBS method is less than 2.07 ppt, which is better than the detection limit reported by the same method. At the same time, compared with the results of SIBS detection of calcium (Ca) element with relatively low metal activity, the related mechanism of UN-SIBS method was analyzed.
【作者單位】： 青島大學(xué)物理科學(xué)學(xué)院;山東省高校光子學(xué)材料與技術(shù)重點實驗室(青島大學(xué));中國海洋大學(xué)光學(xué)光電子實驗室;
【基金】：國家自然科學(xué)基金青年基金項目(11104153) 青島市應(yīng)用研究項目(2015125)資助
【分類號】：O657
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1 何蔓,胡斌,江祖成;單一稀土元素檢測方法的新近進展[J];分析科學(xué)學(xué)報;2005年05期
，本文編號：2351282
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