磁力搅拌和激光辐照处理水溶液对ICP辐射的增强作用  

The Enhancement Research of Magnetic Stirring with Laser Irradiation Aqueous Solution on ICP Source Radiation

作　　者：陈金忠[1] 徐丽晶[1] 苏红新[1] 李旭[1] 王颖[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《光谱学与光谱分析》2016年第9期2966-2970,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61205180);河北省自然科学基金项目(A2008000560)资助

摘　　要：在电感耦合等离子体原子发射光谱法中,仍然是以溶液方式把样品引入到光源。为了提高对水溶液的处理效果,改变其物理性质,采用磁力搅拌与激光辐照相结合的手段,测量了不同实验条件下水溶液的表面张力和粘度。将处理后的溶液引入到电感耦合等离子体(ICP)中,测量了样品元素的谱线强度和信背比以及等离子体的激发温度和电子密度。实验结果表明:在磁力搅拌器的转速为1 197r·min^(-1)、激光输出功率密度为0.227 6 W·cm^(-2)和样品处理时间为15min的优化条件下,溶液的表面张力和粘度比未经处理时的分别减小了27.85%和8.66%;样品元素谱线As 188.980nm,Cd 214.439nm,Cr 267.716nm,Cu324.754nm,Hg 253.652nm和Pb 220.353nm的强度分别提高了32.07%,65.36%,18.27%,32.29%,19.38%和54.28%,信背比分别增大了25.13%,60.97%,18.18%,27.69%,21.11%和48.93%。通过测量等离子体的激发温度和电子密度两个主要参数,在一定程度上解释了水溶液被处理以后等离子体辐射增强的原因。这种预处理水溶液的方法能够明显提高ICP发射光谱强度,而且与单独利用激光辐照水溶液的方法比较,明显缩短了处理样品的时间,有利于提高工作效率。此方法操作简便,在处理样品溶液过程中不存在二次污染问题,便于推广使用。At present,the way to introduce the sample into the inductively coupled plasma atomic emission spectrometry （ICP-AES）light source is still in the form of solution.In order to improve the treatment effect of the aqueous solution and change its physical properties,the surface tension and viscosity under different experimental conditions were measured with magnetic stir-ring combined with laser irradiation..The treated samples were introduced into the inductively coupled plasma （ICP）to meas-ure the spectral line intensity,signal-to-background ratio,excitation temperature and electron density emitted by the ICP source. The experimental results showed that：when the magnetic stirrer rotate speed was 1 197 r·min-1 ,the laser power density was 0.227 6 W·cm-2 and irradiation for 15 min,the surface tension and viscosity of the solution were decreased by 27.85% and 8.66% respectively than those of the untreated solution.As to the element spectral lines of As 188.980 nm,Cd 214.439 nm,Cr 267.716 nm,Cu 324.754 nm,Hg 253.652 nm and Pb 220.353nm：the intensity was enhanced 32.07%,65.36%,18.27%, 32.29%,19.38% and 54.28%;the signal-to-background ratio increased by 25.13%,60.97%,18.18%,27.69%,21.11%and 48.93%,respectively.The enhancement of the plasma radiation was explained to a certain extent by measuring the excita-tion temperature and electron density of the plasma.The processing method of the aqueous solution can effectively improve the spectral intensity and signal-to-background ratio of the ICP.Compared with the laser irradiation aqueous solution separately,this method significantly shortened the processing time,improve the efficiency.This method is simple,with no secondary pollution in the treatment of the sample solution,convenient popularization and use.

关 键 词：磁力搅拌 激光辐照 电感耦合等离子体 光谱强度 信背比 

分 类 号：O657.3[理学—分析化学]