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Hu L.,Huazhong University of Science and Technology | Cheng Q.,Huazhong University of Science and Technology | Chen D.,Ningbo Entry exit Inspection and Quarantine Bureau of China | Ma M.,Ningbo Entry exit Inspection and Quarantine Bureau of China | Wu K.,Huazhong University of Science and Technology
Journal of Hazardous Materials | Year: 2014

It is quite important to develop convenient and rapid analytical methods for trace levels of endocrine disruptors because they heavily affect health and reproduction of humans and animals. Herein, graphene was easily prepared via one-step exfoliation using N-methyl-2-pyrrolidone as solvent, and then used to construct an electrochemical sensor for highly-sensitive detection of diethylstilbestrol (DES) and estradiol (E2). On the surface of prepared graphene film, two independent and greatly-increased oxidation waves were observed at 0.28. V and 0.49. V for DES and E2. The remarkable signal enlargements indicated that the detection sensitivity was improved significantly. The influences of pH value, amount of graphene and accumulation time on the oxidation signals of DES and E2 were discussed. As a result, a highly-sensitive and rapid electrochemical method was newly developed for simultaneous detection of DES and E2. The values of detection limit were evaluated to be 10.87. nM and 4.9. nM for DES and E2. Additionally, this new method was successfully used in lake water samples and the accuracy was satisfactory. © 2014 Elsevier B.V. Source

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