Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 2010, Vol. 27 ›› Issue (02): 201-205.DOI: 10.3724/SP.J.1095.2010.90119

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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

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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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