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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...
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