微波辅助激光诱导击穿光谱增强大米中Cd发射强度的研究  

Study on the Enhancement Intensity of Cd in Rice with Microwave-Assisted Laser-Induced Breakdown Spectroscopy

作　　者：胡慧琴[1] 徐雪红[1] 黄林[2] 姚明印[1] 陈添兵[1] 刘木华[1] 王彩虹[1] 

机构地区：[1]江西农业大学工学院,江西省高校生物光电及应用重点实验室,江西南昌330045 [2]江西农业大学生物科学与工程学院,江西南昌330045

出　　处：《光谱学与光谱分析》2016年第4期1180-1185,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(31460419);江西省重大科技项目(20143ACB21013);赣鄱“555”英才、2014年江西省远航工程计划项目(20140142);江西省研究生创新专项资金项目(YC2014-S182);大学生创新计划项目(201410410010)资助

摘　　要：食品安全问题已成为全世界关注的焦点,对食品中污染物的绿色检测方法有利于环境的可持续发展。以大米中重金属污染物Cd元素为研究对象,分别采用激光诱导击穿光谱(LIBS)和微波辅助激光诱导击穿光谱(MA-LIBS)对空白和实验室污染处理的大米样品进行检测,并选用CdⅠ228.802nm为分析线,探讨目标元素分析谱线等离子体发射强度的增强效果。同时,采用阳极溶出伏安法获取大米中Cd元素的真实含量。研究结果表明,对于实验室配制的浓度范围在2.16~13.69μg·g^(-1)的大米样品,LIBS仅能检测出其中大米Cd真实含量为13.69μg·g^(-1)的样品;而在同一实验条件下,MA-LIBS能检测出所有污染后样品中的Cd元素信号,并且与LIBS方法相比,Cd元素谱线发射强度增强了9~27倍,检测灵敏度提高了6.34倍。结果表明,采用MA-LIBS能有效地增强大米中Cd元素等离子体的发射强度并提高其检测灵敏度。As food safety problem has become the focus of attention all over the world,green detection methods of the contaminants in food is in accordance with the sustainable development of environment.Heavy metal pollutant Cd element in rice was used as the object of study in this work,laser induced breakdown spectroscopy（LIBS）and microwave assisted laser induced breakdown spectroscopy（MA-LIBS）were utilized to detect the blank and laboratory polluted rice samples respectively.The characteristic line of Cd Ⅰ228.802 nm was employed as analytical line to discuss the enhancement effect of plasmas emission intensity for the analytical line of target element.Meanwhile,the actual concentration of Cd in rice was measured by anodic stripping voltammetry.The result displayed that LIBS can just detect the plasmas signals of the sample which contained 13.69μg·g-1 cadmium for the laboratory polluted rice samples which concentration range from 2.16 to 13.69μg·g-1,however,in the same experimental conditions,MA-LIBS can detect the plasmas signals of Cd in all of the contaminated rice samples successfully,and compared with LIBS,the plasmas emission intensity of Cd element was enhanced from 9to 27 times.The results showed that the plasmas emission intensity of Cd element in rice can be enhanced effectively by MA-LIBS,and the detection sensitivity can be effectively improved.

关 键 词：激光诱导击穿光谱 微波辅助激光诱导击穿光谱 大米 重金属 微波增强 

分 类 号：O657.3[理学—分析化学]