Rapid and ultrasensitive colorimetric detection of mercury(II) by chemically initiated aggregation of gold nanoparticles

摘要: The article describes a method for rapid and visual determination of Hg(II) ion using unmodified gold nanoparticles (Au-NPs). It involves the addition Au-NPs to solution containing ions which, however, does not induce color change. Next, lysine is added which induces aggregation causes change from wine-red purple. whole on-site detection process can be executed in less than 15 min. Other amines (ethylenediamine, arginine, melamine) were also investigated with respect their capability aggregation. Notably, only more one amino group found effective, but 0.4 μM pH 8 was give best results. limits Hg (II) are 8.4 pM (for instrumental read-out) 10 read-out). To our knowledge, this LOD better those reported any other existing screening methods. assay interfered by presence common metal even if present 1000-fold excess over concentration. successfully applied spiked tap water samples. We perceive that provides an excellent tool ultrasensitive at low cost, relative ease minimal operation.