Voltammetric Determination of Boron using Poly Xylenol Orange-Modified Pencil Graphite Electrode

Abstract

This study describes a new voltammetric method for sensitive and accurate determination of boron using the poly xylenol orange-modified and oxidized pencil graphite electrode. The oxidation of tiron at +0.86 V in the boron–tiron complex formed in phosphate buffer solution at pH 8 was evaluated as a response. The parameters for voltammetric determination of boron were optimized. The modified electrode was characterized by cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The limits of detection and quantification were estimated to be 28 and 83 µg/L, respectively. The relative standard deviation value was 4.89% for 0.2 mg/L boron. The recovery results were 98.72, 100.53, and 100.14% for tap water, drinking water, and eye lotion samples, respectively. The accuracy of the method was tested using a certified reference material (UME CRM 1201: Elements in Spring Water).