Journal
FOOD CHEMISTRY
Volume 192, Issue -, Pages 351-357Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.07.042
Keywords
Cadmium; Lead; Electrochemical determination; Modified electrode
Funding
- National Natural Science Foundation of China [20875047]
- Water Conservation Science and Technology Project of Jiangsu Province [2013042]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Innovation of Agricultural Science and Technology of Jiangsu Province [CX(15)1012]
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In this paper, L-cysteine/graphene-CS/GCE (L-cys/GR-CS/GCE) was prepared successfully, and its electrochemical properties were characterized by cyclic voltammetry (CV) and electrochemical AC impedance. Moreover, the electrochemical behaviors of Cd2+ and Pb2+ on the proposed electrode were studied by differential pulse anodic stripping voltammetry (DPASV). Experimental parameters, such as the deposition potential and time, the pH value of buffer solution, were optimized. Under the optimized conditions, the linear equations of the DPASV response current with Cd2+ and Pb2+ concentration were I (mu A) = 0.745 C (mu g/L) + 4.539 (R = 0.9986), I (mu A) = 0.437 C (mu g/L) + 2.842 (R = 0.9983), respectively, and the detection limit was 0.45 and 0.12 mu g/L, respectively. Finally, L-cys/GR-CS/GCE was used to detect Cd2+ and Pb2+ in practical samples, and the results were compared with ICP-AES. This idea and method will provide a new approach for food security evaluation. (C) 2015 Elsevier Ltd. All rights reserved.
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