Citation: WANG Jin-Fen, BIAN Chao, TONG Jian-Hua, SUN Ji-Zhou, XIA Shan-Hong. Comparison of Mercury-free Microsensors Based on Gold Nanoparticles for Heavy Metals Detection[J]. Chinese Journal of Analytical Chemistry, ;2012, 40(12): 1791-1796. doi: 10.3724/SP.J.1096.2012.20470 shu

Comparison of Mercury-free Microsensors Based on Gold Nanoparticles for Heavy Metals Detection

1.
¹ State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;

Corresponding author: XIA Shan-Hong,
Received Date: 5 May 2012
Available Online: 8 July 2012
Fund Project: 本文系国家重点基础研究发展规划"973"项目(No.2009CB320300)资助 (No.2009CB320300)

This paper presents two kinds of mercury-free electrochemical microsensors for simultaneous detection of heavy metals, which are L-aspartic acid/L-cysteine/gold nanoparticles (Asp/Cys/GNPs/microelectrode chip) and Sn film/gold nanoparticles modified microelectrode chip (Sn/GNPs/microelectrode chip). Electrochemical analysis of metal ions on Asp/Cys/GNPs/microelectrode chip was investigated by square wave voltammetry under the optimized conditions. The microsensor exhibited wide linear range from 5 μg/L to 2000 μg/L for Cu²⁺ and Pb²⁺ ions, with limit of detection of 1 μg/L. In situ tin film deposition was used in detection of heavy metals for the forming of alloy with heavy metals. Electrochemical analysis of metal ions on Sn/GNPs/microelectrode chip was investigated by square wave stripping voltammetry. The Sn/GNPs/microelectrode chip showed high sensitivity to Cu²⁺, Pb²⁺ and Zn²⁺ ions. This microsensor revealed good linear behavior in the examined concentration ranges from 5 to 500 μg/L for Cu²⁺ and Pb²⁺, from 10 to 500 μg/L for Zn²⁺, with a limit of detection of 2 μg/L for Cu²⁺, 3 μg/L for Pb²⁺ and 5 μg/L for Zn²⁺. In addition, metal ions detection method using the two kinds of microsensor are green, simple, reused and compatible with the microfluid chip for on-site analysis.
- Gold nanoparticles,
- Microelectrode chip,
- Copper,
- Lead,
- Zinc
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沈阳化工大学材料科学与工程学院沈阳 110142