光谱学与光谱分析
基于激光诱导击穿光谱技术的土壤泥浆中Pb元素检测
卢 渊，吴江来，李 颖，郭金家，程 凯，侯华明，郑荣儿*
中国海洋大学光学光电子实验室，山东 青岛 266100
Experimental Investigation of Pb in Soil Slurries by Laser Induced Breakdown Spectroscopy
LU Yuan, WU Jiang-lai, LI Ying, GUO Jin-jia, CHENG Kai, HOU Hua-ming, ZHENG Rong-er*
Optics and Optoelectronics Laboratory, Ocean University of China, Qingdao 266100, China
摘要 ： 激光诱导击穿光谱(LIBS)作为一种新兴的元素分析技术，具有实时在线、非接触、多元素同时探测等诸多优点。将LIBS技术引入土壤泥浆重金属污染的检测分析，力图发展一种针对泥浆重金属污染监测的原位传感技术。实验选择Pb作为探测元素，Mn为内标元素;采用重复频率10 Hz的Nd∶YAG调Q激光器的二倍频(532 nm)输出作为激发光源，CCD收集信号，对实验室配制的不同浓度Pb泥浆样品的LIBS信号进行了探测分析。获得了各种浓度下Pb泥浆样品在Pb 405.78 nm和Mn 403.07 nm处的原子线强度比I Pb /I Mn 及其随浓度变化的规律。结果显示I Pb /I Mn 与样品的含铅浓度有着很好的线性关系，线性拟合相关系数R2 达到0.994 9。初步证实了采用内标法对土壤泥浆中重金属Pb进行LIBS检测分析的可行性。文章还对泥浆重金属LIBS检测的影响因素进行了讨论。
关键词 ：LIBS;土壤泥浆;重金属污染;内标法;Pb
Abstract ：Laser induced breakdown spectroscopy (LIBS) has been shown to be a promising technique for element analysis with many advantages including on-line, real time, standing off and multi-element detection capability. In the present paper, the LIBS experiments for Pb in slurry samples were carried out with the motivation of developing an in-situ sensor for monitoring heavy metal. A Q-switched Nd∶YAG laser operating at 532 nm with repetition frequency of 10 Hz was utilized to generate plasma on the prepared slurry samples, which were doped with same weight manganese as reference and varied concentration of lead. The induced plasma emission was recorded by CCD. The LIBS signals at PbI 405.78 nm and MnI 403.07 nm from the slurry samples were investigated. It was found that the intensity ratio of I Pb /I Mn increased as a linear function of the concentration of Pb with correlation coefficient R 2 of 0.994 9. The obtained results show that LIBS with conjunction of referent element could be developed as a potential technique for contamination analysis of soil slurries. The main influence factors in LIBS signal detection were also discussed.
Key words ：LIBS;Soil slurries;Heavy metal contamination;Referent element;Pb
收稿日期: 2008-11-08
修订日期: 2009-02-12
通讯作者:
郑荣儿
E-mail: rzheng@ouc.edu.cn
引用本文:
卢 渊，吴江来，李 颖，郭金家，程 凯，侯华明，郑荣儿* . 基于激光诱导击穿光谱技术的土壤泥浆中Pb元素检测[J]. 光谱学与光谱分析, 2009, 29(11): 3121-3125.
* . Experimental Investigation of Pb in Soil Slurries by Laser Induced Breakdown Spectroscopy . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(11): 3121-3125.
链接本文:
https://www.gpxygpfx.com/CN/10.3964/j.issn.1000-0593(2009)11-3121-05
或
https://www.gpxygpfx.com/CN/Y2009/V29/I11/3121
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