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The authors report on a method for visual and spectrophotometric determination of silver (I) by using Prussian Blue nanoparticles (PB NPs) as a colorimetric probe. It is based on the finding that the blue PB NPs are converted into colorless silver ferrocyanide ions in the presence of Ag(I) due to the establishment of a dissolution-precipitation equilibrium. The change in absorbance at 700 nm is related...
Gold nanoparticles (AuNPs) were functionalized with the indicator dye Arsenazo III via reductive synthesis of AuNPs in the presence of arsenazo III. The indicator dye is shown to be immobilized on the AuNPs via interaction between gold and sulfo groups. The functionalized AuNPs undergo aggregation in the presence of uranyl ion due to the coordination interaction between arsenazo III and uranyl ion...
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