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Citation: LIU Meng-Qin, FENG Yong-Lan, XU Jin-Sheng, JIANG Jian-Hui, ZENG Rong-Ying. Determination of Trace Lanthanum(Ⅲ) by Fluorescence Quenching Method[J]. Chinese Journal of Applied Chemistry, ;2010, 27(2): 201-205. doi: 10.3724/SP.J.1095.2010.90119 shu

Determination of Trace Lanthanum(Ⅲ) by Fluorescence Quenching Method

a. 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;
b. State Key Laboratory of Chemo/Biosensing and Chemometrics;Chemistry and Chemical Engineering College, Hunan University, Changsha

Received Date: 22 February 2009
Revised Date: 18 June 2009

The fluorescence properties and mechanism of La(Ⅲ),9-3,5-dibromosalicyl fluorone(DBSAF) and sodium dodeceyl sulfate(SDS) fluorescent complex system were investigated. A method was developed for the determination of trace La(Ⅲ) based on the fluorometric quenching effect of DBSAF-SDS.The results indicate that in the buffer solution of (CH₂)₆N₄-HCl at pH=5.4,the La(Ⅲ)-DBSAF-SDS fluorescent complex has maximum excitation at 520 nm,and maximum emission at 560 nm. The fluorescence intensity is proportional to the amount of La(Ⅲ) in a range of 1.6~800 μg/L. The detection limit of La(Ⅲ) is 0.12 μg/L. This method is applicable to the determination of trace La in copper alloy with satisfactory results.
- fluorescence quenching method,
- dibromosalicyl fluorone,
- lanthanum(Ⅲ)
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