# Application of a Novel Solid Silver Microelectrode Array for Anodic Stripping Voltammetric Determination of Thallium(I)

## TL;DR

A new eco-friendly sensor using silver microelectrodes was developed to detect thallium(I) ions in water with high accuracy.

## Contribution

The first use of a solid silver microelectrode array for thallium(I) detection without electrode modification.

## Key findings

- The sensor detected thallium(I) in the range of 5 × 10−10 to 1 × 10−7 mol·L−1 with a detection limit of 1.35 × 10−10 mol·L−1.
- The procedure showed good repeatability with an RSD% of 3.6% for Tl(I) measurements.
- The method was successfully applied to certified reference materials and environmental water samples.

## Abstract

The article reports for the first time the application of a solid silver microelectrode array for the anodic stripping voltammetric determination of thallium(I) ions (Tl(I)). The microelectrode properties of the presented sensor were tested. The proposed solid metal microelectrode array is characterized by its eco-friendly nature due to the use of non-toxic electrode material. The advantage of this procedure is that no surface modification of the microelectrode was required. The optimization of the procedure for determining Tl(I) was performed. The experimental parameters (e.g., pH of supporting electrolyte, conditions of activation step, potential and time of deposition, effects of possible interferences) were investigated. The dependence of the thallium peak current on its concentration was linear in the range from 5 × 10−10 to 1 × 10−7 mol·L−1 (deposition time of 120 s). The estimated detection limit was 1.35 × 10−10 mol·L−1. The repeatability of the procedure expressed as RSD% for a Tl(I) concentration of 2 × 10−8 mol·L−1 was 3.6% (n = 5). The proposed procedure was applied for determining Tl(I) in certified reference materials and for studying recovery in the environmental water sample. The obtained results indicated the possibility of an analytical application of the elaborated procedure in practice.