Journal
MICROCHIMICA ACTA
Volume 185, Issue 2, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2648-7
Keywords
Ore analysis; mPEG; XPS; Dynamic light scattering; Transmission electron microscopy; AAS; UV-Vis; Noble metals
Categories
Funding
- National key research and development plan [2016YFF0203700]
- National Natural Science Foundation of China [51772289, 21778054, 21272263]
- State Key Laboratory of Natural and Biomimetic Drugs [K20160203]
- Fusion project of molecular science and education for Institute of Chemistry [Y52902HED2]
- UCAS students' entrepreneurship research [118900EA12]
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A highly selective method is described for the colorimetric determination of Au(III) ions in acidic solution using gold nanoparticles (AuNPs) functionalized with thiolated methoxy poly(ethylene glycol) (mPEG). The presence of Au(III) induces the aggregation of the PEG-AuNPs, and this is accompanied by a color change from wine red to blue, and a decrease in absorbance at 525 nm. This can be monitored spectrophotometrically and visually. Absorbance at 525 nm linearly drops in the 0.50 to 1.75 mg.L-1 Au(III) concentration range, with a 0.25 mg.L-1 detection limit. The method is surprisingly selective over other metal ions. It was successfully applied to the analysis of ore samples.
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