Determination of silver ions based on the electrogenerated chemiluminescence of silver ions/peroxydisulfate.

Abstract

In this work, a simple, sensitive, and selective method for the determination of silver ions (Ag(+)) was proposed on the basis of the enhancement of Ag(+) on the electrogenerated chemiluminescence (ECL) of peroxydisulfate (S2O8 (2-)), which can be attributed to the obvious electrocatalytic reduction of S2O8 (2-) by Ag(+), giving rise to more abundant sulfate radical anion (SO4 (•-)). Under optimal conditions, a linear range from 4 to 500nM (R = 0.997) with a detection limit of 2.5nM (S/N = 3) was achieved for the detection of Ag(+). The Ag(+)/S2O8 (2-) ECL system could not only provide an assay protocol forthe determination of Ag(+) but also offer an effective way to enhance the ECL of S2O8 (2-), which may act as a promising platform forthe detection of other species such as 4-chlorophenol. Graphical abstract ECL-potential curves of 0.1 M PBS (pH 8.5) containing (a) 500 nM AgNO3, (b) 50 mM K2S2O8,