IN-SITU DETECTION OF HEAVY METAL POLLUTION IN SEAWATER WITH DIAMOND COATED ELECTRODES

Bin Zhao, Jia Li, Xiang Yu, Jing Zhang and Yi Ren
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Bin Zhao: School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, P. R. China
Jia Li: #x2020;Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, P. R. China
Xiang Yu: #x2020;Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, P. R. China
Jing Zhang: #x2020;Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, P. R. China
Yi Ren: School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 04, 1-9

Abstract: Heavy metal pollution endangers seawater and there is urgent need for the development of effective detectors that can provide warning of heavy metal pollution. Anodic stripping voltammetry is applicable for the detection of heavy metal pollution in sea water, but it suffers from two problems that are associated with the mercury electrode used: one is insufficient sensitivity and the other is secondary pollution caused by toxic mercury. In this work, we employed boron-doped diamond electrode as an alternative to mercury electrode for the detection of heavy metals. The BDD electrode was fabricated and its electrochemical properties were ascertained. The results of this work showed that: (1) the electrode prepared has a wide electrochemical window (4.2 V) and low background current (3±2μA). (2) multiple heavy metals (Pb2+, Cd2+, Zn2+ and Cu2+) in seawater samples are detected simultaneously with the optimized electrode, with high sensitivity and good repeatability. (3) the repeatability of the detection meets the values stipulated in the national standard. The detection period is less than 15min, and in situ monitoring of heavy metals in seawater can be achieved by automatic sampling and wireless data transmission.

Keywords: Electrode; water quality detector; concentration; heavy metal ion (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501792

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