荧光猝灭法测定痕量稀土镧(Ⅲ)

应用化学, 2010, 27(2): 201-205. doi: 10.3724/SP.J.1095.2010.90119

荧光猝灭法测定痕量稀土镧(Ⅲ)

刘梦琴 ^1, , 冯泳兰 ^2, , 许金生 ^3, , 蒋健晖 ^4, , 曾荣英 ^5,

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.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

3.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

4.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

5.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

基金项目: 湖南省重点学科建设项目和衡阳市科技局科研计划(2008KJ016) 湖南省自然科学基金重点(06JJ2015) 教育部新世纪优秀人才支持计划(NCET-04-0768) 国家自然科学基金(20205005)

关键词：荧光猝灭法 , (二溴)水杨基荧光酮 , La~(3+)

Determination of Trace Lanthanum(Ⅲ) by Fluorescence Quenching Method

Keywords： fluorescence quenching method , dibromosalicyl fluorone , lanthanum(Ⅲ)

采用荧光光谱法研究9-(3,5-二溴)水杨基荧光酮(DBSAF)与La~(3+)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, La~(3+)与DBSAF生成络合物使DBSAF的荧光猝灭.体系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La~(3+)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.

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 (CH_2)_6N_4-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.

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