基于激光诱导击穿光谱技术的混合溶液重金属元素检测  

Detection of Heavy Metal Elements in the Mixture Solution with Laser Induced Breakdown Spectroscopy

作　　者：宋超[1] 张亚维[2] 高勋[2] 

机构地区：[1]长春理工大学化学与环境工程学院,吉林长春130022 [2]长春理工大学理学院,吉林长春130022

出　　处：《光谱学与光谱分析》2017年第6期1885-1889,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61575030)资助

摘　　要：利用激光诱导击穿光谱技术对混合溶液中的Cu,Mg,Zn和Cd四种重金属元素进行实验测量,实验中采用波长为1 064nm,脉宽10ns,重频10 Hz的激光器。在蒸馏水中加入CuSO4,Mg(NO3)2,Zn(NO3)2和Cd(NO3)2四种溶质,配置7种不同Cu,Mg,Zn和Cd浓度的混合溶液,采用统计探索性数据分析方法处理LIBS实验数据,得到水溶液中Cu,Mg,Zn和Cd元素的定标曲线,拟合度系数R2均大于0.99,计算出Cu,Mg,Zn和Cd四种元素的检测限分别为5.62,4.71,13.67和4.43ppm,单一溶质CuSO4溶液中的Cu元素的LOD值为3.98ppm。最后对单一溶质和四种溶质的LIBS检测结果差异进行了分析。研究结果表明激光诱导击穿光谱技术在环境水污染多种重金属元素检测方面具有潜在的应用前景。In this paper，the concentrations of Cu, Mg, Zn and Cd elements in the mixture solution consing of CuSO4, Mg（NO3）2, Zn（NO3）2 and Cd（NO3）2 were measured with Laser Induced Breakdown Spectroscopy with aqueous jets which were generated within 1 064 nm wavelength of Nd： YAG laser with pulse width of 10ns and repetitive rate of 10 Hz. The mixture solutions of seven different concentrations consist of Cu, Mg, Zn and Cd were compound by adding the four solutes to the distilled water. The LIBS experiment date have been treated with the statistical exploratory data analysis method to abtain calibration curves of Cu, Mg, Zn and Cd elements，whose linear fitting coefficient R2 were all above 0.99, the LOD of Cu, Mg, Zn and Cd elements were determined as 5.62，4.71，13.67 and 4.43 ppm, respectively. The LOD of Cu element was 3.98 ppm for pure CuSO4 solution with better experimental results than that of mixed solution, Finally, the LIBS detected differences were analyzed. The research results show that LIBS has a promising application in detecting heavy metal elements in the environmental wastewater pollution．

关 键 词：激光诱导击穿光谱 液体射流 混合溶液 检测限 

分 类 号：O657.3[理学—分析化学]