Spectrophotometric Determination of Thiosulfate Ion using Silver Nanoparticles

The interaction between aqueous colloidal silver nanoparticles (AgNPs) and thiosulfate ions was studied using UV-Vis absorption and scanning electron microscopy (SEM) techniques. It was found that AgNPs were oxidized by dissolved oxygen in the presence of thiosulfate ions, resulting in a considerable decrease in the intensity of the surface plasmon resonance (SPR) absorption band of AgNPs. So, we propose a simple, cost-effective, rapid, sensitive and selective colorimetric sensor for the detection of thiosulfate using AgNPs in aqueous media. There is a linear relationship between the absorbance intensity of AgNPs and the concentration of thiosulfate ions at ۳۹۴ nm. The proposed method has been successfully used for the determination of thiosulfate in water samples.

کلیدواژه ها:

Silver nanoparticles ، Thiosulfate ، absorption ، surface plasmon resonance