Journal
MICROCHIMICA ACTA
Volume 180, Issue 11-12, Pages 1051-1057Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-013-1030-7
Keywords
Gold nanoparticles; 4-Amino-3-hydrazino-5-mercapto-1,2,4-triazol; Cadmium ion; Probe; Chelation
Categories
Funding
- Natural Science foundation of China [20905021, 21175218, 21275130]
- Foundation of the Ministry of Education of China for Returned Scholars
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We have developed a simple, sensitive and selective colorimetric method for the detection of cadmium(II) (Cd2+) using gold nanoparticles modified with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole. Organic solvents or additives are not required. It is found that Cd2+ induces the aggregation of the modified Au-NPs via chelation, leading to a color change from red to blue. This change can be seen with bare eyes, and monitored by UV-vis spectroscopy, transmission electron microscopy and dynamic light scattering. The detection limit is 30 nM (at a signal-to-noise ratio of 3). The new approach was successfully applied to the detection of Cd2+ in spiked samples of tap water and lake water, and the results agree well with those obtained by flame atomic absorption spectroscopy.
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