磁力搅拌和激光辐照处理水溶液对ICP辐射的增强作用

发布时间：2019-03-04 15:17

【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。
[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.
【作者单位】：河北大学物理科学与技术学院;
【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
【分类号】：O657.31

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