title: A sensitive resonance light scattering spectrometry of trace Hg2+ with sulfur ion modified gold nanoparticles.
abstract: 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.
authors.affiliation: Education Ministry Key Laboratory on Luminescene and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Fan
authors.forename: Yun Fei
authors.initials: YF
authors.lastname: Long
authors.forename: Yuan Fang
authors.initials: YF
authors.lastname: Li
mesh_terms: D006046:Gold / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008027:Light; D008628:Mercury / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D007477:Ions; D013455:Sulfur; D006046:Gold; D008628:Mercury