Cathodically Pretreated AuNPs-BDD Electrode for Detection of Hexavalent Chromium.

Yang Li,Chenyu Xiong,Shanhong Xia,Chao Bian,Chengyao Gao,Yuhao Xu

doi:10.3390/mi11121095

Abstract

Hexavalent chromium (Cr (VI)) has strong oxidizing properties and can result in strong carcinogenic effects on human bodies. Therefore, it is necessary to detect hexavalent chromium sensitively and accurately. This article proposes the gold nanoparticles (AuNPs)–boron-doped diamond (BDD) electrode for the direct determination of chromium with a green and simple detection process by cathodic stripping voltammetry. Gold nanoparticles are used to enhance the detection performance toward Cr (VI). The effect of different pretreatment methods on electrode modification has been studied, and the detection parameters have been optimized. With the optimized conditions, the AuNPs–BDD electrode presents a good linear behavior in a Cr (VI) concentration range of 10 to 1000 μg/L. A low limit of detection of 1.19 μg/L is achieved. The detection process is simple and environmentally friendly. The sensor has been tested for the detection of Cr (VI) in a real water sample with satisfactory results, which indicates potential application of the AuNPs–BDD electrode for the sensitive and onsite detection of Cr (VI).

Highlights

Due to the strong biological toxicity and accumulation of heavy metal, heavy metal pollution can cause serious threats to human health
The scanning electron microscope (SEM) images were obtained by using an S-4800 Field Emission Scanning Electron Microscope (Hitachi, Japan)
AuNPs–boron-doped diamond (BDD) Electrode Detection Principle This paper realizes the direct detection of Cr (VI) utilizing the electrochemical reduction of Cr (VI)

Summary

Introduction

Due to the strong biological toxicity and accumulation of heavy metal, heavy metal pollution can cause serious threats to human health. Hexavalent chromium (Cr (VI)) can oxidize the biological molecules in contact with it, and it has strong stimulating and corrosive effects on the skin and mucous membranes of human body. It can cross-link with the DNA in the nucleus, which leads to rearranging of DNA strands. Due to the rapid development of industry and imperfect environmental protection technology, a large amount of Cr (VI) is discharged into surface water. It is very important to establish accurate and sensitive monitoring of hexavalent chromium in water

Methods

Results

Conclusion