激光诱导荧光探测水体中溶解有机物浓度  

Detection of Dissolved Organic Matter Concentration Using Laser-Induced Fluorescence Technique

作　　者：丁志群[1,2] 刘文清[1] 张玉钧[1] 李宏斌[1] 魏庆农[1] 赵南京[1] 陈东[1] 杨立书[1] 

机构地区：[1]中国科学院环境光学与技术重点实验室,中国科学院安徽光学精密机械研究所 [2]宁波工程学院电信学院,宁波315016

出　　处：《光子学报》2006年第2期217-220,共4页Acta Photonica Sinica

基　　金：中国科学院知识创新工程重要方向性项目(KGCX2-SW-111)资助

摘　　要：用Nd∶YAG激光器的三倍频355nm光作为激发光源,根据激光诱导荧光(LIF)方法激发并探测污染水体的荧光光谱.通过对荧光光谱的分析处理研究归一化荧光强度,即450nm处水中溶解有机物(DOM)峰与405nm处水的拉曼峰的比值,反演溶解有机物浓度.用商品腐殖酸和去离子水配置成已知浓度的溶液代替标准DOM溶液进行标定,得到回归方程.结果证明,DOM的归一化荧光强度与水体中DOM浓度有较好的线性关系,因此LIF方法是对大面积水域水质进行动态遥测的较理想方法.The polluted water column fluorescence spectrum is detected is excited with the third harmonics （355 nm） by laser induced fluorescence technique. of Nd ： YAG laser and After analysed and processed the spectrum data, normalization of fluorescence intensity is obtained, which is the ratio of 450 nm value to 405 nm value. Commercial humic acid is diluted with different quantity of deionized water as water sample of known DOM concentration. The result has been shown that there is a good correlation between DOM concentration and the normalization fluorescence intensity of ultraviolet laser induced fluorescence. Therefore the LIF technique is a good method for the practical utilization of in vivo monitoring polluted water column.

关 键 词：激光诱导荧光 溶解有机物 归一化荧光强度 动态水质监测 

分 类 号：O433.54[机械工程—光学工程] X832[理学—光学]