【摘要】：在電感耦合等離子體原子發(fā)射光譜法中,仍然是以溶液方式把樣品引入到光源。為了提高對水溶液的處理效果,改變其物理性質(zhì),采用磁力攪拌與激光輻照相結(jié)合的手段,測量了不同實驗條件下水溶液的表面張力和粘度。將處理后的溶液引入到電感耦合等離子體(ICP)中,測量了樣品元素的譜線強度和信背比以及等離子體的激發(fā)溫度和電子密度。實驗結(jié)果表明:在磁力攪拌器的轉(zhuǎn)速為1 197r·min~(-1)、激光輸出功率密度為0.227 6 W·cm~(-2)和樣品處理時間為15min的優(yōu)化條件下,溶液的表面張力和粘度比未經(jīng)處理時的分別減小了27.85%和8.66%;樣品元素譜線As 188.980nm,Cd 214.439nm,Cr 267.716nm,Cu324.754nm,Hg 253.652nm和Pb 220.353nm的強度分別提高了32.07%,65.36%,18.27%,32.29%,19.38%和54.28%,信背比分別增大了25.13%,60.97%,18.18%,27.69%,21.11%和48.93%。通過測量等離子體的激發(fā)溫度和電子密度兩個主要參數(shù),在一定程度上解釋了水溶液被處理以后等離子體輻射增強的原因。這種預處理水溶液的方法能夠明顯提高ICP發(fā)射光譜強度,而且與單獨利用激光輻照水溶液的方法比較,明顯縮短了處理樣品的時間,有利于提高工作效率。此方法操作簡便,在處理樣品溶液過程中不存在二次污染問題,便于推廣使用。
[Abstract]:In that inductively coupled plasma atomic emission spectrum method, the sample is still introduce into the light source in a solution manner. In order to improve the treatment effect of aqueous solution, the surface tension and viscosity of the aqueous solution under different experimental conditions were measured by means of magnetic stirring and laser irradiation. The processed solution is introduced into an inductively coupled plasma (ICP), and the spectral line strength and the signal-to-back ratio of the sample element and the excitation temperature and electron density of the plasma are measured. The results show that the surface tension and the viscosity of the solution are 27.85% and 8.66%, respectively, when the rotational speed of the magnetic stirrer is 1 197 r 路 min ~ (-1), the laser output power density is 0.227 6W 路 cm ~ (-2) and the sample processing time is 15 min, and the sample element line As 188.980nm, The intensity of Cd 214.439nm, Cr 267.716 nm, Cu324,754nm, Hg 253.652nm and Pb 220.353nm increased by 32.07%, 65.36%, 18.27%, 32.29%, 19.38% and 54.28%, respectively. The back-to-back ratio increased by 25.13%, 60.97%, 18.18%, 27.69%, 21.11% and 48.93%, respectively. By measuring the excitation temperature and electron density of the plasma, the reason of the enhancement of the plasma radiation after the aqueous solution has been treated is explained to some extent. The method of the pretreatment water solution can obviously improve the ICP emission spectrum intensity, and compared with the method of using the laser irradiation water solution alone, the time of processing the sample is obviously shortened, and the working efficiency is improved. The method has the advantages of simple and convenient operation, no secondary pollution problem in the process of processing the sample solution, and is convenient for popularization and use.
【作者單位】： 河北大學物理科學與技術(shù)學院;
【基金】：國家自然科學基金項目(61205180) 河北省自然科學基金項目(A2008000560)資助
【分類號】：O657.31

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