Abstract
In this study, a selective and easy colorimetric probe was developed for the detection of silver ions. This system relied on the aggregation of gold nanoparticles (AuNPs) with ammonium pyrrolidine dithiocarbamate (APDC) and its anti-aggregation in the presence of silver ions. APDC caused the aggregation of AuNPs which resulted in color change from red to blue. However, in the presence of silver ions, because of their ability to complex with APDC, the aggregation of AuNPs was inhibited and color change occurred in the opposite direction by increasing Ag+ concentration (blue to red). Under optimum conditions, this system exhibited high selectivity to Ag+ over other tested metal ions. This novel probe had advantages such as wide linear range (0.05–0.9 µM) and low detection limit (20 nM). The recovery analysis of river water as real sample confirmed that the proposed colorimetric sensor could be successfully employed in the determination of Ag+ in real water samples.
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