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RESEARCH ARTICLE
Contents Vol 68(2)

MnII-Doped ZnS Quantum Dots Modified with Tiopronin for Mercury(II) Detection

Xin Liu A , Xun-Shou Zhan A , Fang-Ying Wu A B and Li-Hua Ma A
+ Author Affiliations
- Author Affiliations

A Department of Chemistry, Nanchang University, Nanchang 330031, China.

B Corresponding author. Email: fywu@ncu.edu.cn

Australian Journal of Chemistry 68(2) 315-321 https://doi.org/10.1071/CH14016
Submitted: 11 January 2014  Accepted: 1 May 2014   Published: 3 July 2014

Abstract

The simple, low-cost, and rapid detection of aqueous mercuric ions remains a challenge for environmental and biological monitoring and protection. We demonstrate herein a new analytical method to detect Hg2+ based on MnII-doped ZnS quantum dots modified with tiopronin. At pH 7.2, Hg2+ causes the fluorescence intensity of quantum dots modified with tiopronin to decrease linearly proportionally with the concentration of Hg2+. This method is non-responsive to general metal ions, surfactants, and some biomacromolecules even though their concentrations were greater than that of Hg2+. Therefore, a sensitive and selective fluorescence assay for Hg2+ with a low limit of detection (8.9 × 10–9 mol L–1) has been developed and its successful application in real samples such as tap water, lake water, and human serum are also discussed in detail.


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