中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (02): 201-205.DOI: 10.3724/SP.J.1095.2010.90119

• 研究论文 • 上一篇    下一篇

荧光猝灭法测定痕量稀土镧（Ⅲ）

刘梦琴1*,冯泳兰1,许金生1,蒋健晖2,曾荣英1   

  1. (1.衡阳师范学院化学与材料科学系,功能金属有机材料湖南省重点实验室 衡阳 421008;
    2.湖南大学化学化工学院,化学生物传感与计量学国家重点实验室 长沙)
  • 收稿日期:2009-02-23 修回日期:2009-06-19 出版日期:2010-02-10 发布日期:2010-02-10
  • 通讯作者: 刘梦琴,女,副教授; E-mail:liumengqin2004@yahoo.com.cn; 研究方向：光谱分析及化学与生物传感
  • 基金资助:
    国家自然科学基金（20205005）新世纪优秀人才支持计划基金（NCET-04-0768）湖南省自然科学基金重点（06JJ2015）湖南省重点学科建设项目和衡阳市科技局科研计划（2008KJ016）资助项目

A New System for the Determination of Trace Lanthanum (Ⅲ) by Fluorescence Quenching Method

LIU Meng-Qin1*, FENG Yong-Lan1, HU Jin-Sheng1, JIANG Jian-Hui2, ZENG Rong-Ying1   

  1. (1.Department of Chemistry and Materials Science,Hengyang Normal University;Key Laboratory of Functional
    Organometallic Materials of Hengyang Normal University,College of Hunan Province，Hengyang 421008)
    2.State Key Laboratory of Chemo/Biosensing and Chemometrics;Chemistry and
    Chemical Engineering College，Hunan University，Changsha)
  • Received:2009-02-23 Revised:2009-06-19 Published:2010-02-10 Online:2010-02-10

PDF

1243

被引次数

1

摘要：

采用荧光光谱法研究9-（3,5-二溴）水杨基荧光酮(DBSAF)与稀土La3 +的荧光性质，并进行了机理探讨。结果表明，在表面活性剂SDS存在下， La3 +与DBSAF生成络合物使DBSAF的荧光猝灭。体系的激发波长和发射波长分别为520 和560 nm，DBSAF的荧光强度差值与La3 +的含量在1.6～800 μg/L范围内呈良好线性关系，检出限为0.12 μg/L。本方法用于铜合金试样中微量镧的测定，结果满意，并进行了加标回收实验。

关键词: 荧光猝灭法, 水杨基荧光酮, La3 +

Abstract:

The fluorescence properties and mechanism of La(Ⅲ)-DBSAF-SDS fluorescent complex system are described. A method was developed for the microdetermination of La(Ⅲ) based on the fluorometric quenching effect of DBSAF-SDS.The results indicate that in the buffer solution of (CH2)6N4-HCl at pH5.4,the La(Ⅲ)-DBSAF-SDS fluorescent complex has maximum excitation at 520nm,and maximum emission at 560nm.The fluorescence intensity is proportional to the amount of La(Ⅲ) in the range of 1.6~800 μg/L. The detection limit for La (Ⅲ) is 0.12 μg/L.This method is applicable for the microdetermination of La(Ⅲ) in copper alloy with satisfactory results.

Key words: fluorescence quenching method, salicylfluorone, lanthanum (Ⅲ)

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