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A non-aggregation spectrometric determination for mercury ions based on gold nanoparticles and thiocyanuric acid.
- Source :
-
Talanta . Mar2015, Vol. 134, p603-606. 4p. - Publication Year :
- 2015
-
Abstract
- We provide a highly sensitive and selective colorimetric assay to detect mercury ions (Hg 2+ ) in aqueous environment using thiocyanuric acid (TCA) molecule-functionalized gold nanoparticles (AuNPs). This method is based on the thiophilicity of Hg 2+ and AuNPs as well as the unique optical properties of TCA-functionalized AuNPs. In the presence of TCA, AuNPs aggregate due to the strong attraction between thiol groups of TCA and surface-bounded AuCl 4 - /AuCl 2 - ions, which induces the visible color change from red to blue. With the addition of Hg 2+ , Hg 2+ is more apt to interact with thiols than AuNPs. Thus, Hg 2+ can remove the AuNPs of the TCA-functionalized AuNPs and trigger AuNP aggregation redisperse again. This assay can selectively detect Hg 2+ with the detection limits as low as 0.5 nM in aqueous solution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00399140
- Volume :
- 134
- Database :
- Academic Search Index
- Journal :
- Talanta
- Publication Type :
- Academic Journal
- Accession number :
- 100654143
- Full Text :
- https://doi.org/10.1016/j.talanta.2014.11.065