| 19808115 |
Fan Y, Long YF, Li YF: A sensitive resonance light scattering spectrometry of trace Hg2+ with sulfur ion modified gold nanoparticles. Anal Chim Acta. 2009 Oct 27;653(2):207-11. Epub 2009 Sep 17.
A new resonance light scattering (RLS) spectrometric method for mercury ions (Hg (2+)) in aqueous solutions with sulfur ion (S (2-)) modified gold nanoparticles (Au-NPs-S) has been developed in this contribution. It was found that S (2-) at the surface of Au-NPs resulting from the surface modification can interact with Hg (2+) to form very stable S-Hg-S bonds when Hg (2+) concentration is lower than that of S (2-), resulting in the aggregation of Au-NPs-S and causing enhanced RLS signals. The enhanced RLS intensities (DeltaI (RLS)) characterized at 392 nm were found to be proportional to the concentration of Hg (2+) in the range of 0.025-0.25 micromol L (-1) with a detection limit (3sigma) of 0.013 micromol L (-1). Our results showed that this approach has excellent selectivity for Hg (2+) over other substances in aqueous solutions. |
33(0,1,1,3) |