Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide
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 w...
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MDPI AG
2013-09-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/13/10/13063 |
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| author | Qiang Cai Ye-Lei Zhang Xi-Shan Guo Yan-Yan Liu Jin-Ming Jian |
| author_facet | Qiang Cai Ye-Lei Zhang Xi-Shan Guo Yan-Yan Liu Jin-Ming Jian |
| author_sort | Qiang Cai |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T22:11:16Z |
| format | Article |
| id | doaj.art-f1ba9994703b45e8a0a12aeaca0b09d7 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T22:11:16Z |
| publishDate | 2013-09-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-f1ba9994703b45e8a0a12aeaca0b09d72022-12-22T04:00:33ZengMDPI AGSensors1424-82202013-09-011310130631307510.3390/s131013063Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene OxideQiang CaiYe-Lei ZhangXi-Shan GuoYan-Yan LiuJin-Ming JianIn 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.http://www.mdpi.com/1424-8220/13/10/13063reduced graphene oxide (rGO)electrochemical depositionscreen-printed carbon electrode (SPCE)square wave voltammetryPb2+ |
| spellingShingle | Qiang Cai Ye-Lei Zhang Xi-Shan Guo Yan-Yan Liu Jin-Ming Jian Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide Sensors reduced graphene oxide (rGO) electrochemical deposition screen-printed carbon electrode (SPCE) square wave voltammetry Pb2+ |
| title | Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide |
| title_full | Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide |
| title_fullStr | Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide |
| title_full_unstemmed | Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide |
| title_short | Fast and Sensitive Detection of Pb2+ in Foods Using Disposable Screen-Printed Electrode Modified by Reduced Graphene Oxide |
| title_sort | fast and sensitive detection of pb2 in foods using disposable screen printed electrode modified by reduced graphene oxide |
| topic | reduced graphene oxide (rGO) electrochemical deposition screen-printed carbon electrode (SPCE) square wave voltammetry Pb2+ |
| url | http://www.mdpi.com/1424-8220/13/10/13063 |
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