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International Journal of Analytical Chemistry
Volume 2017 (2017), Article ID 1727126, 8 pages
https://doi.org/10.1155/2017/1727126
Research Article

Detection of Cu2+ in Water Based on Histidine-Gold Labeled Multiwalled Carbon Nanotube Electrochemical Sensor

1College of Water Sciences, Beijing Normal University, Engineering Research Center for Groundwater Pollution Control and Remediation, Ministry of Education, Beijing 100875, China
2Hunan Province Environmental Monitoring Centre, Protection Key Laboratory of Monitoring for Heavy Metal Pollutants State Environmental, Changsha 410014, China
3College of Biology, Hunan University, Changsha 410082, China
4China Environmental Monitoring Centre, Beijing 100012, China

Correspondence should be addressed to Chunyi Tong; moc.361@00lacidareerf and Jinsheng Wang; moc.361@sjgnawunb

Received 8 November 2016; Revised 7 December 2016; Accepted 27 December 2016; Published 20 March 2017

Academic Editor: Hian Kee Lee

Copyright © 2017 Rilong Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the strong interaction between histidine and copper ions and the signal enhancement effect of gold-labeling carbon nanotubes, an electrochemical sensor is established and used to measure copper ions in river water. In this study the results show that the concentrations of copper ion have well linear relationship with the peak current in the range of 10−11–10−7 mol/L, and the limit of detection is 10−12 mol/L. When using this method to detect copper ions in the Xiangjiang River, the test results are consistent with the atomic absorption method. This study shows that the sensor is convenient to be used in daily monitoring of copper ions in river water.