A new simple and reliable Hg2+ detection system based on anti-aggregation of unmodified gold nanoparticles in the presence of O-phenylenediamine
| Autor: | Yonglong Li, Tianhua Li, Yujie Zhang, Yumin Leng, Zhen-Yu Shen, Aiguo Wu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Anti aggregation
Metals and Alloys Analytical chemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound Tap water chemistry Covalent bond Colloidal gold o-Phenylenediamine Materials Chemistry Electrical and Electronic Engineering Spectroscopy Selectivity Instrumentation Nuclear chemistry |
| Zdroj: | Sensors and Actuators B: Chemical. 200:140-146 |
| ISSN: | 0925-4005 |
| Popis: | A simple and reliable colorimetric detection system based on anti-aggregation of gold nanoparticles (AuNPs) is proposed for rapid detection of Hg2+ with high selectivity and sensitivity. O-phenylenediamine (OPD) can cause the aggregation of AuNPs due to formation of the strong covalent NH-Au bond, and then induce color change of the AuNPs solution from red to blue. However, in the presence of Hg2+, OPD prefers to combine with Hg2+ rather than AuNPs resulting in inhibition of the color change. Based on the anti-aggregation mechanism, Hg2+ can be detected by observing the color change of AuNPs solution containing OPD. After optimization, the selectivity of this Hg2+ detection system by the naked eyes and UV-vis spectra is excellent comparing with other ions. The limit of the detection CLOD) is 0.1 mu M by the naked eyes and 5.0 nM by UV-vis spectroscopy, which is lower than the mercury toxic level (10 nM) defined by US Environmental Protection Agency. It's a good linear relationship between A(520)/A(680) and Hg2+. concentration from 0.01 mu M to 2.0 mu M, which is used for the quantitative assay of Hg2+. The applicability of our detection system is also verified by analysis of Hg2+ in tap water and lake water. (C) 2014 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect