The Study on Novel Microelectrode Array Chips for the Detection of Heavy Metals in Water Pollution

Abstract

Qualitative and quantitative analysis of trace heavy metals in aqueous environment are rapidly assuming significance along with the rapid development of industry. In this paper, gold microelectrode array (MEA) plated with mercury film was used for simultaneous voltammetric detection of zinc, cadmium, lead and copper ions in water. The electrochemical behavior and the actual surface area of the MEA were investigated by cyclic voltammetry in K 3 [Fe(CN) 6 ]. Electrochemical impedance spectrum (EIS) was utilized to examine the deposition of mercury on the electrode surface. Based on anodic stripping voltammetry, mercury filmÀAu MEA was applied to the detection of heavy metals in artificial analyte, where good calibrate linearity was obtained for cadmium, lead and copper ions, but with zinc exhibiting poor linearity.

Voltammetric determination of metal ions beyond mercury electrodes. A review

“…The ability of mercury to form amalgams with some electrodic materials like gold and silver has also been considered to design sensors for the analysis of metal ions, although the improvement is not reliable. Nowadays, the use of these materials is combined with a proper design to give an added value to the electrode [68][69][70]. Likewise, the use of mercury oxide as a precursor for the formation of a mercury film has also been considered for the determination of Cd(II) and Pb(II) in milk samples [71].…”

In situ determination of cadmium and lead in water environment based on microelectrode array combined PLS with local optimum method

“…The detection limits were 0.1 mg L À1 and 0.5 mg L À1 . 20 Fig. 2 The algorithm flow diagram of LOM.…”

“…Au-MEA was fabricated in the laboratory using the standard microfabrication technology. 20 The Ag/AgCl electrode was immersed in saturated KCl solution to assure the stable potential.…”

A Palladium-Tin Modified Microband Electrode Array for Nitrate Determination

“…Microelectrode has its properties and advantages such as fast response, low background noise and high current density [ 27 , 28 ]. Microelectrode array with the advantages of microelectrode is developed to obtain a higher current output and it has been used for numerous applications including biochemical and environmental analysis [ 29 ].…”