A Rhodamine-Based Sensor for Chromogenic Detection of Cu^(2+) and Fluorescent Detection of Fe^(3+)  

作　　者：YU Xianglin QU Hao HU Qihui HOU Kun YAN Yushi WU Dan ZHANG Pian LI Junbo 

机构地区：[1]Key Laboratory for Green Chemical Process of Ministry of Education,Wuhan Institute of Technology

出　　处：《Wuhan University Journal of Natural Sciences》2014年第2期129-136,共8页武汉大学学报（自然科学英文版）

基　　金：Supported by National Natural Science Foundation of China(20901063,51203127);Wuhan Chenguang Scheme(Grant 201050231049)established under Wuhan Science and Technology Bureau;Outstanding youth project of Hubei Provincial Department of Education(20121509)

摘　　要：A rhodamine-benzimidazole conjugate （RB） as a probe was investigated. UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu^2＋, while other transition metal ions induced a little more absorption. The absorption value of RB solution at 552 nm has a linear correlation with Cu^2＋ concentration between 35-70 μmol/L; the detection limit reached 6.82x 10-2 gmol/L, which is lower than the settled limitation for copper in the drinking water （-30 μmol/L） standardized by World Health Organization （WHO）. Moreover, FL analysis showed that only Fe^3＋ could induce large fluorescence intensity enhance- ment at 582 nm; other common metal ions including Cu^2＋ cannot induce the enhancement. There was a good linear correlation be Fe^3＋ tween relatwe fluorescence ntenslty and Fe concentration ranging from 2 μmol/L to 20 μmol/L, and the detection limit reached 1.70×10^-2 μmol/L. The results showed that RB could detect Cu^2＋ and Fe^3＋ simultaneously, with the UV-Vis and fluorescence spectroscopy, respectively.A rhodamine-benzimidazole conjugate （RB） as a probe was investigated. UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu^2＋, while other transition metal ions induced a little more absorption. The absorption value of RB solution at 552 nm has a linear correlation with Cu^2＋ concentration between 35-70 μmol/L; the detection limit reached 6.82x 10-2 gmol/L, which is lower than the settled limitation for copper in the drinking water （-30 μmol/L） standardized by World Health Organization （WHO）. Moreover, FL analysis showed that only Fe^3＋ could induce large fluorescence intensity enhance- ment at 582 nm; other common metal ions including Cu^2＋ cannot induce the enhancement. There was a good linear correlation be Fe^3＋ tween relatwe fluorescence ntenslty and Fe concentration ranging from 2 μmol/L to 20 μmol/L, and the detection limit reached 1.70×10^-2 μmol/L. The results showed that RB could detect Cu^2＋ and Fe^3＋ simultaneously, with the UV-Vis and fluorescence spectroscopy, respectively.

关 键 词：rhodamine B SENSOR multiple analytes copper ions iron ions 

分 类 号：O151.2[理学—数学] Q503[理学—基础数学]