Detection of Trace Hg(II) in Cosmetics and Aqueous Solution by a Gold Nanospikes Electrochemical Sensor

Abstract

An ultrasensitive and rapid electrochemical detection of trace Hg(II) sensor was developed. The significantly amplified electrochemical signals were caused by the high specific surface area of the electrochemical sensor. Scanning electron microscopy showed that the gold nanospikes were 200-300 nm in length and 50 nm in diameter. The electrochemical properties of sensor were characterized by square wave voltammetry. Experimental parameters were optimized using square wave stripping voltammetry. The linear range of sensor for Hg(II) is 3×10-10 mol l-1 ~ 7×10-7 mol l-1 and the limit of detection is 1×10-10 mol l-1. Hg(II) was successfully quantified in river water and cosmetics. The original Hg(II) in loose powder, sunblock, and whitening lotion using the high ratio surface area electrochemical sensor determination were found to be 2.234, 2.056, and 2.347 mg kg-1, respectively. The results are within the range of standard values, the RSD are 1.7 %, 1.5 %, and 2.1 %, respectively. The HRSA Au electrode sensor displays high sensitivity, excellent stability, reproducibility, and is more convenient than ICP-MS and AFS verification methods. We look forward to the possibility that the HRSA Au electrode sensor can be used for real-time monitoring of mercury ions in water and cosmetics in the future.

Synergetic Effect of β-Cyclodextrin and CuO Nanocomposite for Ultrasensitive Determination of Chloramphenicol in Food

“…7 The traditional detection methods are reliable for the analysis of CAP but still are restricted for most instruments expensive and demand laboratory setup, professional operation, and high operating costs. Different from the traditional detection methods, electrochemical method has become one of the important methods for the efficient detection of CAP due to low operating costs, 16,17 a wide range of applications, 18,19 high sensitivity, and more importantly, it can achieve online monitoring. Usually, the physical/chemical properties of electrode-modified materials have a significant impact on the performance of electrochemical methods.…”

Determination of Trace Cd(II) in Water and Cosmetics based on Au/GO/CuO Nanocomposite Functionalized Electrochemical Sensor

“…31 Gold nanoparticles are excellent materials for the preparation of sensors due to their unique physical and chemical properties for detecting heavy metals. 32,33 Graphene and its derivatives exhibit high electrochemical activity, especially, graphene oxide has an enormous surface area and extraordinary electronic conductivity, due to its structural features. 34 Herein, a simple method for the green synthesis of CuO nanoparticles is reported, using Sophora Japonica bud water extract as a reducing and capping agent.…”

Structural, Photophysical, and Transport Properties of Porous MAPbBr3 Single Nanowire and Nanodevice for Electrochemical Sensing

“…33 More recently, ultrasensitive electrochemical sensors with high specific surface area of gold nanospikes for detecting Hg(II) were reported by Cao and co-workers. 34 A facile method of making ultralow loading, Au/ C nanofilm electrodes was demonstrated for detecting As (III) in water. 35 Synthesis of porous MAPbBr 3 nanowires were demonstrated via the self-template-directed synthesis technique, 36 in which the Pbcontaining precursor nanowires were used as the sacrificial template and Pb 2+ source at the same time in the presence of MABr and HBr in solution.…”