Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide

Sensors

Jin-Ming Jian²  Yan-Yan Liu²  Ye-Lei Zhang¹  Xi-Shan Guo² 

[1] Linyi University, Linyi 276005, China; E-Mail:;College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; E-Mails:

关键词: reduced graphene oxide (rGO);    electrochemical deposition;    screen-printed carbon electrode (SPCE);    square wave voltammetry;    Pb²⁺;   

DOI  :  10.3390/s131013063

来源: mdpi

【 摘 要 】

In this study, reduced graphene oxide (rGO) was electrochemically deposited on the surface of screen-printed carbon electrodes (SPCE) to prepare a disposable sensor for fast detection of Pb²⁺ in foods. The SEM images showed that the rGO was homogeneously deposited onto the electrode surface with a wrinkled nanostructure, which provided 2D bridges for electron transport and a larger active area for Pb²⁺ adsorption. Results showed that rGO modification enhanced the activity of the electrode surface, and significantly improved the electrochemical properties of SPCE. The rGO modified SPCE (rGO-SPCE) was applied to detect Pb²⁺ in standard aqueous solution, showing a sharp stripping peak and a relatively constant peak potential in square wave anodic stripping voltammetry (SWASV). The linear range for Pb²⁺ detection was 5∼200 ppb (R² = 0.9923) with a low detection limit of 1 ppb (S/N = 3). The interference of Cd²⁺ and Cu²⁺ at low concentrations was effectively avoided. Finally, the rGO-SPCE was used for determination of lead in real tap water, juice, preserved eggs and tea samples. Compared with results from graphite furnace atomic absorption spectroscopy (GFAAS), the results based on rGO-SPCE were both accurate and reliable, suggesting that the disposable sensor has great potential in application for fast, sensitive and low-cost detection of Pb²⁺ in foods.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.