应用LIBS技术定量检测湖水样品中的铜  

Quantitative Determination of Cu in Lake Water by Laser Induced Breakdown Spectroscopy

作　　者：李敏[1,2] 朱心勇[2] 徐媛[2] 彭秋梅[2] 刘木华[2] 姚明印[2] 

机构地区：[1]萍乡市高级技工学校,江西萍乡337055 [2]江西农业大学生物光电及应用重点实验室,江西南昌330045

出　　处：《激光与光电子学进展》2013年第1期192-195,共4页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(30972052);新世纪优秀人才支持计划(090168);江西省科技厅科技支撑计划(2010BSB08091)资助课题

摘　　要：为了对湖水中的铜元素含量进行定性分析及定量检测,实验采用了激光诱导击穿光谱(LIBS)技术,进行了理论分析和实验验证。以120mJ激光能量值,1.28μs延时时间和1Hz重复频率,测定了Cu元素浓度在2～75mg/L区域内变化时324.75nm谱线的强度值。对Cu元素的特征谱线进行了定性分析;建立了Cu元素浓度与谱线强度的定标曲线,该定标曲线线性拟合相关度R2=0.99;通过检测限公式得到铜元素的检测限为7.37mg/L。采用该定标曲线对湖水中的Cu元素含量进行了定量检测,得到湖水中Cu元素浓度为10mg/L。实验表明,采用LIBS方法可对水溶液中重金属元素铜进行快速检测。Qualitative analysis and quantitative detection on the content of copper in the lake are implemented by laser induced breakdown spectroscopy. In the experiment, the spectral intensity value of Cu at 324. 75 nm is measured in the concentration of 2 ~ 75 mg/L with laser frequency of 1 Hz. Qualitative analysis is carried out on energy of 120 mJ, delay time of 1.28μs and repetition the characteristic spectral line of Cu, and the calibration curve of Cu about the concentration and spectral intensity, with the correlation coefficient R2 =0.99, is obtained. The detection limit of Cu is 7.37 mg/L through the detection limit formula. In the end, the content of Cu in the lake is detected using the calibration curve and the result is 10 mg/L. The experiment proves that the heavy mental of Cu in water solution can be quickly detected by LIBS.

关 键 词：光谱学 激光诱导击穿光谱 水溶液 Cu元素 检测限 定量检测 

分 类 号：S632.5[农业科学—蔬菜学]