本文選題：液體陰極輝光放電-原子發(fā)射光譜　切入點：金屬元素測量　出處：《光譜學(xué)與光譜分析》2017年10期 　論文類型：期刊論文

【摘要】：液體陰極輝光放電-原子發(fā)射光譜是近些年興起的一種水體金屬元素檢測技術(shù)。該技術(shù)具有開放大氣環(huán)境工作,進(jìn)樣簡便,體積小,運行費用低,可同時檢測多種金屬元素等顯著特征。根據(jù)之前的研究工作可知,金屬元素的濃度不僅與自身的某一條譜線強度有關(guān),而且還與自身其他的譜線或者基體中其他元素的譜線強度有關(guān)。為提高該技術(shù)的檢測能力和精度,降低實驗過程中基體效應(yīng)的影響,以及更加充分地利用光譜信息,采用多元線性回歸法對光譜信息進(jìn)行定量分析。選取PbⅠ368.35nm和PbⅠ405.78nm兩條特征譜線,建立Pb元素濃度與這兩條光譜線強度的二元線性回歸方程;相比于標(biāo)準(zhǔn)曲線法,Pb元素的擬合度R2從0.986 5提高到0.998 7,兩組Pb測試液的相對誤差從34.00%和29.00%降低到14.20%和1.51%。為降低復(fù)雜成分中基體效應(yīng)的影響,建立Na的濃度與NaⅠ589.38nm,ZnⅠ213.8nm,PbⅠ405.78nm和Hβ四條特征譜線強度的四元線性回歸方程;擬合度R2從標(biāo)準(zhǔn)曲線法的0.955 8提高到0.995 6,兩組Na測試液的相對誤差從11.67%和14.71%降低到2.33%和3.57%。以上結(jié)果表明:相比于標(biāo)準(zhǔn)曲線法,多元線性回歸法可以降低實驗過程中基體效應(yīng)的影響,并且能更加充分地利用光譜信息,能提高擬合度R2,以及降低測量的誤差,從而提高液體陰極輝光放電-原子發(fā)射光譜定量分析金屬元素的精度。
[Abstract]:Liquid cathodic glow discharge-atomic emission spectroscopy (LCD-AAS) is a new technique for the detection of metallic elements in water body. It has the advantages of open atmospheric environment, simple sample injection, small size and low operating cost. It is possible to detect a variety of metal elements at the same time. According to previous research work, the concentration of metal elements is not only related to the intensity of one of their own spectral lines, It is also related to the intensity of other spectral lines or other elements in the matrix. In order to improve the detection ability and accuracy of the technique, reduce the influence of the matrix effect during the experiment, and make full use of the spectral information, The multivariate linear regression method was used to quantitatively analyze the spectral information. Two characteristic spectral lines, Pb 鈪，

本文編號：1559243