Determination of trace Hg2+ ions based on the fluorescence resonance energy transfer between fluorescent brightener and CdTe quantum dots

作者：Tao, Huilin^*; Liao, Xiufen; Xu, Mingze; Li, Shuhuai; Zhong, Fuxin; Yi, Zhongsheng

来源：Journal of Luminescence, 2014, 146: 376-381.

DOI：10.1016/j.jlumin.2013.10.005

• Fluorescent brightener
• CdTe quantum dots
• Fluorescence resonance energy transfer
• Fluorescence quenching
• Hg2+

The fluorescence resonance energy transfer between fluorescent brightener (FB, donor) and CdTe quantum dots (CdTe QDs, acceptor) was studied and a new method for detecting Hg2+ ions in water samples was accordingly developed in this paper. It was found that the effective energy transfer occurred from FE to CdTe QDs in Tris-HCl buffer solution at pH=8.2, in which the QDs' fluorescence intensity increased greatly. Then the fluorescence quenching occurred as Hg2+ interacted with CdTe. Under the optimized conditions, there was a linear relationship between the fluorescence quenching intensity and the concentration of Hg2+. Hg2+ could be determined in the concentration range of 8.0 x 10(-9) - 8.0 x 10(-7) g L-1 with a detection limit of 6.6 x 10(-10) g L-1 (S/N=3). The method was applied to the determination of Hg2+ in water samples via the standard addition method, and the recovery rate obtained was 97.3-105.5%. Published by Elsevier B.V.

• 出版日期2014-2
• 单位桂林理工大学