Ultrasensitive electrochemiluminescence determination of trace Ag ions based on the signal amplification caused by its catalytic effect on Mn(II) oxidation using graphite catheter as electrode

Publication date: 1 September 2018
Source:Talanta, Volume 187
Author(s): Zhengping Ji, Yun Shu, Qin Xu, Xiaoya Hu
In this work, an ultrasensitive electrochemiluminescence (ECL) method was established for the detection of trace amount of Ag ions (Ag⁺). In sulfuric acid medium, Ag(II), the electro-oxidized product of Ag(I), oxidizes manganese ions (Mn²⁺) to produce permanganate (MnO4^-) by using a pair of graphite catheters as electrodes. While permanganate and luminol can produce strong chemiluminescence, based on the catalytic effect of Ag(II) on Mn²⁺ oxidation, there is a good linear relationship between the concentration of Ag⁺ and luminescence intensity. Under optimized conditions, the linear range of this method for Ag⁺ is from 0.2 to 150 nM with a detection limit of 0.06 nM. The method was applied for determination of Ag⁺ in various water samples with satisfactory results.

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