大气压辉光放电结合圆柱约束增强激光诱导击穿光谱应用于土壤中稀土元素的检测  

Atmospheric Pressure Glow Discharge Combined with Cylindrical Confinement Enhanced Laser-Induced Breakdown Spectroscopy for Determination of Rare Earth in Soil

作　　者：李悦[1,2] 张国霞 蔡朝晴[2,3] 邱汉迅 汪正[2,3] LI Yue;ZHANG Guo-Xia;CAI Zhao-Qing;QIU Han-Xun;WANG Zheng(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093 [2]中国科学院上海硅酸盐研究所,上海201899 [3]中国科学院大学材料科学与光电工程中心,北京100049

出　　处：《分析化学》2022年第9期1384-1390,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.E27GJ616);中国科学院仪器设备功能开发技术创新项目(No.E07YQ7170G);上海市无机材料测试与表征技术平台项目(No.19DZ2290700)资助。

摘　　要：土壤中的稀土污染会影响植物生长并通过食物链在动物和人类体内富集,引发环境问题,危害人类健康,因此有必要对土壤中稀土元素的含量进行检测。激光诱导击穿光谱(Laser-induced breakdown spectroscopy,LIBS)在土壤等固体样品分析方面具有原位、无损、实时及多元素同步分析等优势,但该技术的检测灵敏度无法满足痕量元素定量分析的要求。本研究采用大气压辉光放电(Atmospheric pressure glow discharge,APGD)和圆柱约束(Cylindrical confinement,CC)相结合的方法,提高LIBS的检测灵敏度,并将其应用于土壤中稀土元素(Y、La、Eu、Yb和Lu)的检测。结果表明,APGD和CC将LIBS对Y、La、Eu、Yb和Lu元素的检测灵敏度分别提升了11.6、9.3、7.9、8.2和7.6倍。将所构建系统应用于土壤标准物质和未知土壤样品的分析,测得标准样品及未知土壤样品中Y、La、Eu、Yb和Lu元素的含量与ICP-OES测量值的相对误差分别为1.5%~8.6%和1.8%~7.0%,表明所构建系统具有良好的准确度。Rare earth pollution in soil affects plant growth and accumulates in animals and humans through the food chain,and causes serious environmental and human health issues.To take effective measures to control the rare earth pollution,it is necessary to detect the content of rare earth elements in soil.Laser-induced breakdown spectroscopy(LIBS)has many advantages including in-situ,non-destructive,real-time and multi-element simultaneous analysis for solid samples such as soil.However,the sensitivity of this technique is low,which limits its application in the quantitative analysis of trace elements.In this work,a new method utilizing the combination of atmospheric pressure glow discharge(APGD)and cylindrical confinement(CC)was proposed to improve the detection sensitivity of laser-induced breakdown spectroscopy,which was applied to determination of Y,La,Eu,Yb and Lu rare earth elements in soil.The results showed that the detection sensitivity of LIBS for Y,La,Eu,Yb and Lu were enhanced by 11.6,9.3,7.9,8.2 and 7.6 times by APGD and CC,respectively.To verify the accuracy of the proposed system,it was applied to the detection of soil certified reference materials and an unknown soil sample,and the relative errors between the detection values of this work and those of ICP-OES were 1.5%-8.6%and 1.8%-7.0%,respectively.

关 键 词：激光诱导击穿光谱 大气压辉光放电 土壤 稀土元素 

分 类 号：X833[环境科学与工程—环境工程] O657.38[理学—分析化学]