期刊
MICROCHIMICA ACTA
卷 176, 期 1-2, 页码 57-64出版社
SPRINGER WIEN
DOI: 10.1007/s00604-011-0691-3
关键词
Gold nanoparticle; Mercury(II); Dithia-diaza ligand; Colorimetric detection; Naked-eye
资金
- Chulalongkorn University [GRU 53-005-23-003, FW002A]
- program Strategic Scholarships for Frontier Research Network for the Ph.D. Program Thai Doctoral degree
- Higher Education Research Promotion
- National Research University of Thailand, Office of the Higher Education Commission [FW652I]
We have developed a simple method for the highly selective colorimetric detection of dissolved mercury(II) ions via direct formation of gold nanoparticles (AuNPs). The dithia-diaza ligand 2-[3-(2-amino-ethylsulfanyl)-propylsulfanyl]-ethylamine (AEPE) was used as a stabilizer to protect AuNPs from aggregation and to impart highly selective recognition of Hg(II) ion over other metal ions. A solution of Au(III) ion is directly reduced by sodium borohydride in the presence of AEPE and the detergent Triton X-100. This results in the formation of AEPE-AuNPs and a red coloration of the solution. On the other hand, in the presence of Hg(II), the solution turns blue within a few seconds after the addition of borohydride. This can be detected spectrophotometrically or even visually. The method was successfully applied to quantify Hg(II) levels in water sample, with a minimum detectable concentration as low as 35 nM.
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